Merge #9346

9346: Refactor / clean up hir_ty tests r=flodiebold a=flodiebold

Notable changes:
 - unify `check_types` and `check_mismatches` into `check`, which supports both kinds of annotations (`check_types` still exists because I didn't want to change all the annotations, but uses the same implementation)
 - because of that, `check_types` now fails on any type mismatches; also annotations always have to hit the exact range
 - there's also `check_no_mismatches` for when we explicitly just want to check that there are no type mismatches without giving any annotations (`check` will fail without annotations)
 - test annotations can now be overlapping (they point to the nearest line that has actual code in that range):
```
// ^^^^ annotation
//    ^^^^^^^^^ another annotation
```

Co-authored-by: Florian Diebold <[email protected]>

12 files changed, 557 insertions, 996 deletions

diff --git a/crates/hir_ty/src/chalk_db.rs b/crates/hir_ty/src/chalk_db.rs
index a4c09c742..a55b99de0 100644
--- a/crates/hir_ty/src/chalk_db.rs
+++ b/crates/hir_ty/src/chalk_db.rs
@@ -2,6 +2,7 @@
 //! about the code that Chalk needs.
 use std::sync::Arc;
 
+use cov_mark::hit;
 use log::debug;
 
 use chalk_ir::{cast::Cast, fold::shift::Shift, CanonicalVarKinds};
@@ -106,7 +107,9 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
         };
 
         fn local_impls(db: &dyn HirDatabase, module: ModuleId) -> Option<Arc<TraitImpls>> {
-            db.trait_impls_in_block(module.containing_block()?)
+            let block = module.containing_block()?;
+            hit!(block_local_impls);
+            db.trait_impls_in_block(block)
         }
 
         // Note: Since we're using impls_for_trait, only impls where the trait
diff --git a/crates/hir_ty/src/test_db.rs b/crates/hir_ty/src/test_db.rs
index 4640ea821..b99a03492 100644
--- a/crates/hir_ty/src/test_db.rs
+++ b/crates/hir_ty/src/test_db.rs
@@ -86,16 +86,20 @@ impl FileLoader for TestDB {
 }
 
 impl TestDB {
-    pub(crate) fn module_for_file(&self, file_id: FileId) -> ModuleId {
+    pub(crate) fn module_for_file_opt(&self, file_id: FileId) -> Option<ModuleId> {
         for &krate in self.relevant_crates(file_id).iter() {
             let crate_def_map = self.crate_def_map(krate);
             for (local_id, data) in crate_def_map.modules() {
                 if data.origin.file_id() == Some(file_id) {
-                    return crate_def_map.module_id(local_id);
+                    return Some(crate_def_map.module_id(local_id));
                 }
             }
         }
-        panic!("Can't find module for file")
+        None
+    }
+
+    pub(crate) fn module_for_file(&self, file_id: FileId) -> ModuleId {
+        self.module_for_file_opt(file_id).unwrap()
     }
 
     pub(crate) fn extract_annotations(&self) -> FxHashMap<FileId, Vec<(TextRange, String)>> {
diff --git a/crates/hir_ty/src/tests.rs b/crates/hir_ty/src/tests.rs
index b873585c4..0651f34ae 100644
--- a/crates/hir_ty/src/tests.rs
+++ b/crates/hir_ty/src/tests.rs
@@ -11,23 +11,21 @@ mod incremental;
 
 use std::{collections::HashMap, env, sync::Arc};
 
-use base_db::{fixture::WithFixture, FileRange, SourceDatabase, SourceDatabaseExt};
+use base_db::{fixture::WithFixture, FileRange, SourceDatabaseExt};
 use expect_test::Expect;
 use hir_def::{
     body::{Body, BodySourceMap, SyntheticSyntax},
-    child_by_source::ChildBySource,
     db::DefDatabase,
+    expr::{ExprId, PatId},
     item_scope::ItemScope,
-    keys,
     nameres::DefMap,
     src::HasSource,
-    AssocItemId, DefWithBodyId, LocalModuleId, Lookup, ModuleDefId,
+    AssocItemId, DefWithBodyId, HasModule, LocalModuleId, Lookup, ModuleDefId,
 };
 use hir_expand::{db::AstDatabase, InFile};
 use once_cell::race::OnceBool;
 use stdx::format_to;
 use syntax::{
-    algo,
     ast::{self, AstNode, NameOwner},
     SyntaxNode,
 };
@@ -59,51 +57,55 @@ fn setup_tracing() -> Option<tracing::subscriber::DefaultGuard> {
 }
 
 fn check_types(ra_fixture: &str) {
-    check_types_impl(ra_fixture, false)
+    check_impl(ra_fixture, false, true, false)
 }
 
 fn check_types_source_code(ra_fixture: &str) {
-    check_types_impl(ra_fixture, true)
-}
-
-fn check_types_impl(ra_fixture: &str, display_source: bool) {
-    let _tracing = setup_tracing();
-    let db = TestDB::with_files(ra_fixture);
-    let mut checked_one = false;
-    for (file_id, annotations) in db.extract_annotations() {
-        for (range, expected) in annotations {
-            let ty = type_at_range(&db, FileRange { file_id, range });
-            let actual = if display_source {
-                let module = db.module_for_file(file_id);
-                ty.display_source_code(&db, module).unwrap()
-            } else {
-                ty.display_test(&db).to_string()
-            };
-            assert_eq!(expected, actual);
-            checked_one = true;
-        }
-    }
-
-    assert!(checked_one, "no `//^` annotations found");
+    check_impl(ra_fixture, false, true, true)
 }
 
 fn check_no_mismatches(ra_fixture: &str) {
-    check_mismatches_impl(ra_fixture, true)
+    check_impl(ra_fixture, true, false, false)
 }
 
-#[allow(unused)]
-fn check_mismatches(ra_fixture: &str) {
-    check_mismatches_impl(ra_fixture, false)
+fn check(ra_fixture: &str) {
+    check_impl(ra_fixture, false, false, false)
 }
 
-fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
+fn check_impl(ra_fixture: &str, allow_none: bool, only_types: bool, display_source: bool) {
     let _tracing = setup_tracing();
-    let (db, file_id) = TestDB::with_single_file(ra_fixture);
-    let module = db.module_for_file(file_id);
-    let def_map = module.def_map(&db);
+    let (db, files) = TestDB::with_many_files(ra_fixture);
+
+    let mut had_annotations = false;
+    let mut mismatches = HashMap::new();
+    let mut types = HashMap::new();
+    for (file_id, annotations) in db.extract_annotations() {
+        for (range, expected) in annotations {
+            let file_range = FileRange { file_id, range };
+            if only_types {
+                types.insert(file_range, expected);
+            } else if expected.starts_with("type: ") {
+                types.insert(file_range, expected.trim_start_matches("type: ").to_string());
+            } else if expected.starts_with("expected") {
+                mismatches.insert(file_range, expected);
+            } else {
+                panic!("unexpected annotation: {}", expected);
+            }
+            had_annotations = true;
+        }
+    }
+    assert!(had_annotations || allow_none, "no `//^` annotations found");
 
     let mut defs: Vec<DefWithBodyId> = Vec::new();
-    visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
+    for file_id in files {
+        let module = db.module_for_file_opt(file_id);
+        let module = match module {
+            Some(m) => m,
+            None => continue,
+        };
+        let def_map = module.def_map(&db);
+        visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
+    }
     defs.sort_by_key(|def| match def {
         DefWithBodyId::FunctionId(it) => {
             let loc = it.lookup(&db);
@@ -118,37 +120,59 @@ fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
             loc.source(&db).value.syntax().text_range().start()
         }
     });
-    let mut mismatches = HashMap::new();
-    let mut push_mismatch = |src_ptr: InFile<SyntaxNode>, mismatch: TypeMismatch| {
-        let range = src_ptr.value.text_range();
-        if src_ptr.file_id.call_node(&db).is_some() {
-            panic!("type mismatch in macro expansion");
-        }
-        let file_range = FileRange { file_id: src_ptr.file_id.original_file(&db), range };
-        let actual = format!(
-            "expected {}, got {}",
-            mismatch.expected.display_test(&db),
-            mismatch.actual.display_test(&db)
-        );
-        mismatches.insert(file_range, actual);
-    };
+    let mut unexpected_type_mismatches = String::new();
     for def in defs {
         let (_body, body_source_map) = db.body_with_source_map(def);
         let inference_result = db.infer(def);
+
+        for (pat, ty) in inference_result.type_of_pat.iter() {
+            let node = match pat_node(&body_source_map, pat, &db) {
+                Some(value) => value,
+                None => continue,
+            };
+            let range = node.as_ref().original_file_range(&db);
+            if let Some(expected) = types.remove(&range) {
+                let actual = if display_source {
+                    ty.display_source_code(&db, def.module(&db)).unwrap()
+                } else {
+                    ty.display_test(&db).to_string()
+                };
+                assert_eq!(actual, expected);
+            }
+        }
+
+        for (expr, ty) in inference_result.type_of_expr.iter() {
+            let node = match expr_node(&body_source_map, expr, &db) {
+                Some(value) => value,
+                None => continue,
+            };
+            let range = node.as_ref().original_file_range(&db);
+            if let Some(expected) = types.remove(&range) {
+                let actual = if display_source {
+                    ty.display_source_code(&db, def.module(&db)).unwrap()
+                } else {
+                    ty.display_test(&db).to_string()
+                };
+                assert_eq!(actual, expected);
+            }
+        }
+
         for (pat, mismatch) in inference_result.pat_type_mismatches() {
-            let syntax_ptr = match body_source_map.pat_syntax(pat) {
-                Ok(sp) => {
-                    let root = db.parse_or_expand(sp.file_id).unwrap();
-                    sp.map(|ptr| {
-                        ptr.either(
-                            |it| it.to_node(&root).syntax().clone(),
-                            |it| it.to_node(&root).syntax().clone(),
-                        )
-                    })
-                }
-                Err(SyntheticSyntax) => continue,
+            let node = match pat_node(&body_source_map, pat, &db) {
+                Some(value) => value,
+                None => continue,
             };
-            push_mismatch(syntax_ptr, mismatch.clone());
+            let range = node.as_ref().original_file_range(&db);
+            let actual = format!(
+                "expected {}, got {}",
+                mismatch.expected.display_test(&db),
+                mismatch.actual.display_test(&db)
+            );
+            if let Some(annotation) = mismatches.remove(&range) {
+                assert_eq!(actual, annotation);
+            } else {
+                format_to!(unexpected_type_mismatches, "{:?}: {}\n", range.range, actual);
+            }
         }
         for (expr, mismatch) in inference_result.expr_type_mismatches() {
             let node = match body_source_map.expr_syntax(expr) {
@@ -158,45 +182,70 @@ fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
                 }
                 Err(SyntheticSyntax) => continue,
             };
-            push_mismatch(node, mismatch.clone());
-        }
-    }
-    let mut checked_one = false;
-    for (file_id, annotations) in db.extract_annotations() {
-        for (range, expected) in annotations {
-            let file_range = FileRange { file_id, range };
-            if let Some(mismatch) = mismatches.remove(&file_range) {
-                assert_eq!(mismatch, expected);
+            let range = node.as_ref().original_file_range(&db);
+            let actual = format!(
+                "expected {}, got {}",
+                mismatch.expected.display_test(&db),
+                mismatch.actual.display_test(&db)
+            );
+            if let Some(annotation) = mismatches.remove(&range) {
+                assert_eq!(actual, annotation);
             } else {
-                assert!(false, "Expected mismatch not encountered: {}\n", expected);
+                format_to!(unexpected_type_mismatches, "{:?}: {}\n", range.range, actual);
             }
-            checked_one = true;
         }
     }
+
     let mut buf = String::new();
-    for (range, mismatch) in mismatches {
-        format_to!(buf, "{:?}: {}\n", range.range, mismatch,);
+    if !unexpected_type_mismatches.is_empty() {
+        format_to!(buf, "Unexpected type mismatches:\n{}", unexpected_type_mismatches);
+    }
+    if !mismatches.is_empty() {
+        format_to!(buf, "Unchecked mismatch annotations:\n");
+        for m in mismatches {
+            format_to!(buf, "{:?}: {}\n", m.0.range, m.1);
+        }
     }
-    assert!(buf.is_empty(), "Unexpected type mismatches:\n{}", buf);
+    if !types.is_empty() {
+        format_to!(buf, "Unchecked type annotations:\n");
+        for t in types {
+            format_to!(buf, "{:?}: type {}\n", t.0.range, t.1);
+        }
+    }
+    assert!(buf.is_empty(), "{}", buf);
+}
 
-    assert!(checked_one || allow_none, "no `//^` annotations found");
+fn expr_node(
+    body_source_map: &BodySourceMap,
+    expr: ExprId,
+    db: &TestDB,
+) -> Option<InFile<SyntaxNode>> {
+    Some(match body_source_map.expr_syntax(expr) {
+        Ok(sp) => {
+            let root = db.parse_or_expand(sp.file_id).unwrap();
+            sp.map(|ptr| ptr.to_node(&root).syntax().clone())
+        }
+        Err(SyntheticSyntax) => return None,
+    })
 }
 
-fn type_at_range(db: &TestDB, pos: FileRange) -> Ty {
-    let file = db.parse(pos.file_id).ok().unwrap();
-    let expr = algo::find_node_at_range::<ast::Expr>(file.syntax(), pos.range).unwrap();
-    let fn_def = expr.syntax().ancestors().find_map(ast::Fn::cast).unwrap();
-    let module = db.module_for_file(pos.file_id);
-    let func = *module.child_by_source(db)[keys::FUNCTION]
-        .get(&InFile::new(pos.file_id.into(), fn_def))
-        .unwrap();
-
-    let (_body, source_map) = db.body_with_source_map(func.into());
-    if let Some(expr_id) = source_map.node_expr(InFile::new(pos.file_id.into(), &expr)) {
-        let infer = db.infer(func.into());
-        return infer[expr_id].clone();
-    }
-    panic!("Can't find expression")
+fn pat_node(
+    body_source_map: &BodySourceMap,
+    pat: PatId,
+    db: &TestDB,
+) -> Option<InFile<SyntaxNode>> {
+    Some(match body_source_map.pat_syntax(pat) {
+        Ok(sp) => {
+            let root = db.parse_or_expand(sp.file_id).unwrap();
+            sp.map(|ptr| {
+                ptr.either(
+                    |it| it.to_node(&root).syntax().clone(),
+                    |it| it.to_node(&root).syntax().clone(),
+                )
+            })
+        }
+        Err(SyntheticSyntax) => return None,
+    })
 }
 
 fn infer(ra_fixture: &str) -> String {
diff --git a/crates/hir_ty/src/tests/coercion.rs b/crates/hir_ty/src/tests/coercion.rs
index 713b74165..87089f09d 100644
--- a/crates/hir_ty/src/tests/coercion.rs
+++ b/crates/hir_ty/src/tests/coercion.rs
@@ -1,27 +1,22 @@
-use expect_test::expect;
-
-use super::{check_infer, check_infer_with_mismatches, check_no_mismatches, check_types};
+use super::{check, check_no_mismatches, check_types};
 
 #[test]
-fn infer_block_expr_type_mismatch() {
-    check_infer(
+fn block_expr_type_mismatch() {
+    // FIXME fix double type mismatch
+    check(
         r"
-        fn test() {
-            let a: i32 = { 1i64 };
-        }
+fn test() {
+    let a: i32 = { 1i64 };
+              // ^^^^^^^^ expected i32, got i64
+                // ^^^^ expected i32, got i64
+}
         ",
-        expect![[r"
-            10..40 '{     ...4 }; }': ()
-            20..21 'a': i32
-            29..37 '{ 1i64 }': i64
-            31..35 '1i64': i64
-        "]],
     );
 }
 
 #[test]
 fn coerce_places() {
-    check_infer(
+    check_no_mismatches(
         r#"
 //- minicore: coerce_unsized
 struct S<T> { a: T }
@@ -46,81 +41,25 @@ fn test2() {
     let g: (&[_], &[_]) = (arr, arr);
 }
 "#,
-        expect![[r#"
-            30..31 '_': &[T]
-            44..55 '{ loop {} }': T
-            46..53 'loop {}': !
-            51..53 '{}': ()
-            64..65 '_': S<&[T]>
-            81..92 '{ loop {} }': T
-            83..90 'loop {}': !
-            88..90 '{}': ()
-            121..132 '{ loop {} }': *mut [T; 2]
-            123..130 'loop {}': !
-            128..130 '{}': ()
-            159..172 '{     gen() }': *mut [U]
-            165..168 'gen': fn gen<U>() -> *mut [U; 2]
-            165..170 'gen()': *mut [U; 2]
-            185..419 '{     ...rr); }': ()
-            195..198 'arr': &[u8; 1]
-            211..215 '&[1]': &[u8; 1]
-            212..215 '[1]': [u8; 1]
-            213..214 '1': u8
-            226..227 'a': &[u8]
-            236..239 'arr': &[u8; 1]
-            249..250 'b': u8
-            253..254 'f': fn f<u8>(&[u8]) -> u8
-            253..259 'f(arr)': u8
-            255..258 'arr': &[u8; 1]
-            269..270 'c': &[u8]
-            279..286 '{ arr }': &[u8]
-            281..284 'arr': &[u8; 1]
-            296..297 'd': u8
-            300..301 'g': fn g<u8>(S<&[u8]>) -> u8
-            300..315 'g(S { a: arr })': u8
-            302..314 'S { a: arr }': S<&[u8]>
-            309..312 'arr': &[u8; 1]
-            325..326 'e': [&[u8]; 1]
-            340..345 '[arr]': [&[u8]; 1]
-            341..344 'arr': &[u8; 1]
-            355..356 'f': [&[u8]; 2]
-            370..378 '[arr; 2]': [&[u8]; 2]
-            371..374 'arr': &[u8; 1]
-            376..377 '2': usize
-            388..389 'g': (&[u8], &[u8])
-            406..416 '(arr, arr)': (&[u8], &[u8])
-            407..410 'arr': &[u8; 1]
-            412..415 'arr': &[u8; 1]
-        "#]],
     );
 }
 
 #[test]
-fn infer_let_stmt_coerce() {
-    check_infer(
+fn let_stmt_coerce() {
+    check_no_mismatches(
         r"
-        fn test() {
-            let x: &[isize] = &[1];
-            let x: *const [isize] = &[1];
-        }
-        ",
-        expect![[r#"
-            10..75 '{     ...[1]; }': ()
-            20..21 'x': &[isize]
-            34..38 '&[1]': &[isize; 1]
-            35..38 '[1]': [isize; 1]
-            36..37 '1': isize
-            48..49 'x': *const [isize]
-            68..72 '&[1]': &[isize; 1]
-            69..72 '[1]': [isize; 1]
-            70..71 '1': isize
-        "#]],
+//- minicore: coerce_unsized
+fn test() {
+    let x: &[isize] = &[1];
+    let x: *const [isize] = &[1];
+}
+",
     );
 }
 
 #[test]
-fn infer_custom_coerce_unsized() {
-    check_infer(
+fn custom_coerce_unsized() {
+    check(
         r#"
 //- minicore: coerce_unsized
 use core::{marker::Unsize, ops::CoerceUnsized};
@@ -138,46 +77,22 @@ fn foo3<T>(x: C<[T]>) -> C<[T]> { x }
 
 fn test(a: A<[u8; 2]>, b: B<[u8; 2]>, c: C<[u8; 2]>) {
     let d = foo1(a);
+              // ^ expected A<[{unknown}]>, got A<[u8; 2]>
     let e = foo2(b);
+     // ^ type: B<[u8]>
     let f = foo3(c);
+     // ^ type: C<[u8]>
 }
 "#,
-        expect![[r#"
-            306..307 'x': A<[T]>
-            327..332 '{ x }': A<[T]>
-            329..330 'x': A<[T]>
-            344..345 'x': B<[T]>
-            365..370 '{ x }': B<[T]>
-            367..368 'x': B<[T]>
-            382..383 'x': C<[T]>
-            403..408 '{ x }': C<[T]>
-            405..406 'x': C<[T]>
-            418..419 'a': A<[u8; 2]>
-            433..434 'b': B<[u8; 2]>
-            448..449 'c': C<[u8; 2]>
-            463..529 '{     ...(c); }': ()
-            473..474 'd': A<[{unknown}]>
-            477..481 'foo1': fn foo1<{unknown}>(A<[{unknown}]>) -> A<[{unknown}]>
-            477..484 'foo1(a)': A<[{unknown}]>
-            482..483 'a': A<[u8; 2]>
-            494..495 'e': B<[u8]>
-            498..502 'foo2': fn foo2<u8>(B<[u8]>) -> B<[u8]>
-            498..505 'foo2(b)': B<[u8]>
-            503..504 'b': B<[u8; 2]>
-            515..516 'f': C<[u8]>
-            519..523 'foo3': fn foo3<u8>(C<[u8]>) -> C<[u8]>
-            519..526 'foo3(c)': C<[u8]>
-            524..525 'c': C<[u8; 2]>
-        "#]],
     );
 }
 
 #[test]
-fn infer_if_coerce() {
-    check_infer(
+fn if_coerce() {
+    check_no_mismatches(
         r#"
-//- minicore: unsize
-fn foo<T>(x: &[T]) -> &[T] { loop {} }
+//- minicore: coerce_unsized
+fn foo<T>(x: &[T]) -> &[T] { x }
 fn test() {
     let x = if true {
         foo(&[1])
@@ -186,35 +101,15 @@ fn test() {
     };
 }
 "#,
-        expect![[r#"
-            10..11 'x': &[T]
-            27..38 '{ loop {} }': &[T]
-            29..36 'loop {}': !
-            34..36 '{}': ()
-            49..125 '{     ...  }; }': ()
-            59..60 'x': &[i32]
-            63..122 'if tru...     }': &[i32]
-            66..70 'true': bool
-            71..96 '{     ...     }': &[i32]
-            81..84 'foo': fn foo<i32>(&[i32]) -> &[i32]
-            81..90 'foo(&[1])': &[i32]
-            85..89 '&[1]': &[i32; 1]
-            86..89 '[1]': [i32; 1]
-            87..88 '1': i32
-            102..122 '{     ...     }': &[i32; 1]
-            112..116 '&[1]': &[i32; 1]
-            113..116 '[1]': [i32; 1]
-            114..115 '1': i32
-        "#]],
     );
 }
 
 #[test]
-fn infer_if_else_coerce() {
-    check_infer(
+fn if_else_coerce() {
+    check_no_mismatches(
         r#"
 //- minicore: coerce_unsized
-fn foo<T>(x: &[T]) -> &[T] { loop {} }
+fn foo<T>(x: &[T]) -> &[T] { x }
 fn test() {
     let x = if true {
         &[1]
@@ -223,35 +118,15 @@ fn test() {
     };
 }
 "#,
-        expect![[r#"
-            10..11 'x': &[T]
-            27..38 '{ loop {} }': &[T]
-            29..36 'loop {}': !
-            34..36 '{}': ()
-            49..125 '{     ...  }; }': ()
-            59..60 'x': &[i32]
-            63..122 'if tru...     }': &[i32]
-            66..70 'true': bool
-            71..91 '{     ...     }': &[i32; 1]
-            81..85 '&[1]': &[i32; 1]
-            82..85 '[1]': [i32; 1]
-            83..84 '1': i32
-            97..122 '{     ...     }': &[i32]
-            107..110 'foo': fn foo<i32>(&[i32]) -> &[i32]
-            107..116 'foo(&[1])': &[i32]
-            111..115 '&[1]': &[i32; 1]
-            112..115 '[1]': [i32; 1]
-            113..114 '1': i32
-        "#]],
     )
 }
 
 #[test]
-fn infer_match_first_coerce() {
-    check_infer(
+fn match_first_coerce() {
+    check_no_mismatches(
         r#"
-//- minicore: unsize
-fn foo<T>(x: &[T]) -> &[T] { loop {} }
+//- minicore: coerce_unsized
+fn foo<T>(x: &[T]) -> &[T] { x }
 fn test(i: i32) {
     let x = match i {
         2 => foo(&[2]),
@@ -260,39 +135,12 @@ fn test(i: i32) {
     };
 }
 "#,
-        expect![[r#"
-            10..11 'x': &[T]
-            27..38 '{ loop {} }': &[T]
-            29..36 'loop {}': !
-            34..36 '{}': ()
-            47..48 'i': i32
-            55..149 '{     ...  }; }': ()
-            65..66 'x': &[i32]
-            69..146 'match ...     }': &[i32]
-            75..76 'i': i32
-            87..88 '2': i32
-            87..88 '2': i32
-            92..95 'foo': fn foo<i32>(&[i32]) -> &[i32]
-            92..101 'foo(&[2])': &[i32]
-            96..100 '&[2]': &[i32; 1]
-            97..100 '[2]': [i32; 1]
-            98..99 '2': i32
-            111..112 '1': i32
-            111..112 '1': i32
-            116..120 '&[1]': &[i32; 1]
-            117..120 '[1]': [i32; 1]
-            118..119 '1': i32
-            130..131 '_': i32
-            135..139 '&[3]': &[i32; 1]
-            136..139 '[3]': [i32; 1]
-            137..138 '3': i32
-        "#]],
     );
 }
 
 #[test]
-fn infer_match_second_coerce() {
-    check_infer(
+fn match_second_coerce() {
+    check_no_mismatches(
         r#"
 //- minicore: coerce_unsized
 fn foo<T>(x: &[T]) -> &[T] { loop {} }
@@ -304,33 +152,6 @@ fn test(i: i32) {
     };
 }
 "#,
-        expect![[r#"
-            10..11 'x': &[T]
-            27..38 '{ loop {} }': &[T]
-            29..36 'loop {}': !
-            34..36 '{}': ()
-            47..48 'i': i32
-            55..149 '{     ...  }; }': ()
-            65..66 'x': &[i32]
-            69..146 'match ...     }': &[i32]
-            75..76 'i': i32
-            87..88 '1': i32
-            87..88 '1': i32
-            92..96 '&[1]': &[i32; 1]
-            93..96 '[1]': [i32; 1]
-            94..95 '1': i32
-            106..107 '2': i32
-            106..107 '2': i32
-            111..114 'foo': fn foo<i32>(&[i32]) -> &[i32]
-            111..120 'foo(&[2])': &[i32]
-            115..119 '&[2]': &[i32; 1]
-            116..119 '[2]': [i32; 1]
-            117..118 '2': i32
-            130..131 '_': i32
-            135..139 '&[3]': &[i32; 1]
-            136..139 '[3]': [i32; 1]
-            137..138 '3': i32
-        "#]],
     );
 }
 
@@ -338,94 +159,52 @@ fn test(i: i32) {
 fn coerce_merge_one_by_one1() {
     cov_mark::check!(coerce_merge_fail_fallback);
 
-    check_infer(
+    check(
         r"
-        fn test() {
-            let t = &mut 1;
-            let x = match 1 {
-                1 => t as *mut i32,
-                2 => t as &i32,
-                _ => t as *const i32,
-            };
-        }
+fn test() {
+    let t = &mut 1;
+    let x = match 1 {
+        1 => t as *mut i32,
+        2 => t as &i32,
+           //^^^^^^^^^ expected *mut i32, got &i32
+        _ => t as *const i32,
+    };
+    x;
+  //^ type: *const i32
+}
         ",
-        expect![[r"
-            10..144 '{     ...  }; }': ()
-            20..21 't': &mut i32
-            24..30 '&mut 1': &mut i32
-            29..30 '1': i32
-            40..41 'x': *const i32
-            44..141 'match ...     }': *const i32
-            50..51 '1': i32
-            62..63 '1': i32
-            62..63 '1': i32
-            67..68 't': &mut i32
-            67..80 't as *mut i32': *mut i32
-            90..91 '2': i32
-            90..91 '2': i32
-            95..96 't': &mut i32
-            95..104 't as &i32': &i32
-            114..115 '_': i32
-            119..120 't': &mut i32
-            119..134 't as *const i32': *const i32
-    "]],
     );
 }
 
 #[test]
 fn return_coerce_unknown() {
-    check_infer_with_mismatches(
+    check_types(
         r"
-        fn foo() -> u32 {
-            return unknown;
-        }
+fn foo() -> u32 {
+    return unknown;
+         //^^^^^^^ u32
+}
         ",
-        expect![[r"
-            16..39 '{     ...own; }': u32
-            22..36 'return unknown': !
-            29..36 'unknown': u32
-        "]],
     );
 }
 
 #[test]
 fn coerce_autoderef() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r"
-        struct Foo;
-        fn takes_ref_foo(x: &Foo) {}
-        fn test() {
-            takes_ref_foo(&Foo);
-            takes_ref_foo(&&Foo);
-            takes_ref_foo(&&&Foo);
-        }
-        ",
-        expect![[r"
-            29..30 'x': &Foo
-            38..40 '{}': ()
-            51..132 '{     ...oo); }': ()
-            57..70 'takes_ref_foo': fn takes_ref_foo(&Foo)
-            57..76 'takes_...(&Foo)': ()
-            71..75 '&Foo': &Foo
-            72..75 'Foo': Foo
-            82..95 'takes_ref_foo': fn takes_ref_foo(&Foo)
-            82..102 'takes_...&&Foo)': ()
-            96..101 '&&Foo': &&Foo
-            97..101 '&Foo': &Foo
-            98..101 'Foo': Foo
-            108..121 'takes_ref_foo': fn takes_ref_foo(&Foo)
-            108..129 'takes_...&&Foo)': ()
-            122..128 '&&&Foo': &&&Foo
-            123..128 '&&Foo': &&Foo
-            124..128 '&Foo': &Foo
-            125..128 'Foo': Foo
-        "]],
+struct Foo;
+fn takes_ref_foo(x: &Foo) {}
+fn test() {
+    takes_ref_foo(&Foo);
+    takes_ref_foo(&&Foo);
+    takes_ref_foo(&&&Foo);
+}",
     );
 }
 
 #[test]
 fn coerce_autoderef_generic() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r#"
 struct Foo;
 fn takes_ref<T>(x: &T) -> T { *x }
@@ -435,34 +214,12 @@ fn test() {
     takes_ref(&&&Foo);
 }
 "#,
-        expect![[r"
-            28..29 'x': &T
-            40..46 '{ *x }': T
-            42..44 '*x': T
-            43..44 'x': &T
-            57..126 '{     ...oo); }': ()
-            63..72 'takes_ref': fn takes_ref<Foo>(&Foo) -> Foo
-            63..78 'takes_ref(&Foo)': Foo
-            73..77 '&Foo': &Foo
-            74..77 'Foo': Foo
-            84..93 'takes_ref': fn takes_ref<&Foo>(&&Foo) -> &Foo
-            84..100 'takes_...&&Foo)': &Foo
-            94..99 '&&Foo': &&Foo
-            95..99 '&Foo': &Foo
-            96..99 'Foo': Foo
-            106..115 'takes_ref': fn takes_ref<&&Foo>(&&&Foo) -> &&Foo
-            106..123 'takes_...&&Foo)': &&Foo
-            116..122 '&&&Foo': &&&Foo
-            117..122 '&&Foo': &&Foo
-            118..122 '&Foo': &Foo
-            119..122 'Foo': Foo
-        "]],
     );
 }
 
 #[test]
 fn coerce_autoderef_block() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r#"
 //- minicore: deref
 struct String {}
@@ -473,71 +230,32 @@ fn test() {
     takes_ref_str(&{ returns_string() });
 }
 "#,
-        expect![[r#"
-            90..91 'x': &str
-            99..101 '{}': ()
-            132..143 '{ loop {} }': String
-            134..141 'loop {}': !
-            139..141 '{}': ()
-            154..199 '{     ... }); }': ()
-            160..173 'takes_ref_str': fn takes_ref_str(&str)
-            160..196 'takes_...g() })': ()
-            174..195 '&{ ret...ng() }': &String
-            175..195 '{ retu...ng() }': String
-            177..191 'returns_string': fn returns_string() -> String
-            177..193 'return...ring()': String
-        "#]],
     );
 }
 
 #[test]
 fn closure_return_coerce() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r"
-        fn foo() {
-            let x = || {
-                if true {
-                    return &1u32;
-                }
-                &&1u32
-            };
+fn foo() {
+    let x = || {
+        if true {
+            return &1u32;
         }
-        ",
-        expect![[r"
-            9..105 '{     ...  }; }': ()
-            19..20 'x': || -> &u32
-            23..102 '|| {  ...     }': || -> &u32
-            26..102 '{     ...     }': &u32
-            36..81 'if tru...     }': ()
-            39..43 'true': bool
-            44..81 '{     ...     }': ()
-            58..70 'return &1u32': !
-            65..70 '&1u32': &u32
-            66..70 '1u32': u32
-            90..96 '&&1u32': &&u32
-            91..96 '&1u32': &u32
-            92..96 '1u32': u32
-        "]],
+        &&1u32
+    };
+}",
     );
 }
 
 #[test]
 fn coerce_fn_item_to_fn_ptr() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r"
-        fn foo(x: u32) -> isize { 1 }
-        fn test() {
-            let f: fn(u32) -> isize = foo;
-        }
-        ",
-        expect![[r"
-            7..8 'x': u32
-            24..29 '{ 1 }': isize
-            26..27 '1': isize
-            40..78 '{     ...foo; }': ()
-            50..51 'f': fn(u32) -> isize
-            72..75 'foo': fn foo(u32) -> isize
-        "]],
+fn foo(x: u32) -> isize { 1 }
+fn test() {
+    let f: fn(u32) -> isize = foo;
+}",
     );
 }
 
@@ -545,110 +263,62 @@ fn coerce_fn_item_to_fn_ptr() {
 fn coerce_fn_items_in_match_arms() {
     cov_mark::check!(coerce_fn_reification);
 
-    check_infer_with_mismatches(
+    check_types(
         r"
-        fn foo1(x: u32) -> isize { 1 }
-        fn foo2(x: u32) -> isize { 2 }
-        fn foo3(x: u32) -> isize { 3 }
-        fn test() {
-            let x = match 1 {
-                1 => foo1,
-                2 => foo2,
-                _ => foo3,
-            };
-        }
-        ",
-        expect![[r"
-            8..9 'x': u32
-            25..30 '{ 1 }': isize
-            27..28 '1': isize
-            39..40 'x': u32
-            56..61 '{ 2 }': isize
-            58..59 '2': isize
-            70..71 'x': u32
-            87..92 '{ 3 }': isize
-            89..90 '3': isize
-            103..192 '{     ...  }; }': ()
-            113..114 'x': fn(u32) -> isize
-            117..189 'match ...     }': fn(u32) -> isize
-            123..124 '1': i32
-            135..136 '1': i32
-            135..136 '1': i32
-            140..144 'foo1': fn foo1(u32) -> isize
-            154..155 '2': i32
-            154..155 '2': i32
-            159..163 'foo2': fn foo2(u32) -> isize
-            173..174 '_': i32
-            178..182 'foo3': fn foo3(u32) -> isize
-        "]],
+fn foo1(x: u32) -> isize { 1 }
+fn foo2(x: u32) -> isize { 2 }
+fn foo3(x: u32) -> isize { 3 }
+fn test() {
+    let x = match 1 {
+        1 => foo1,
+        2 => foo2,
+        _ => foo3,
+    };
+    x;
+  //^ fn(u32) -> isize
+}",
     );
 }
 
 #[test]
 fn coerce_closure_to_fn_ptr() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r"
-        fn test() {
-            let f: fn(u32) -> isize = |x| { 1 };
-        }
-        ",
-        expect![[r"
-            10..54 '{     ...1 }; }': ()
-            20..21 'f': fn(u32) -> isize
-            42..51 '|x| { 1 }': |u32| -> isize
-            43..44 'x': u32
-            46..51 '{ 1 }': isize
-            48..49 '1': isize
-        "]],
+fn test() {
+    let f: fn(u32) -> isize = |x| { 1 };
+}",
     );
 }
 
 #[test]
 fn coerce_placeholder_ref() {
     // placeholders should unify, even behind references
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r"
-        struct S<T> { t: T }
-        impl<TT> S<TT> {
-            fn get(&self) -> &TT {
-                &self.t
-            }
-        }
-        ",
-        expect![[r"
-            50..54 'self': &S<TT>
-            63..86 '{     ...     }': &TT
-            73..80 '&self.t': &TT
-            74..78 'self': &S<TT>
-            74..80 'self.t': TT
-        "]],
+struct S<T> { t: T }
+impl<TT> S<TT> {
+    fn get(&self) -> &TT {
+        &self.t
+    }
+}",
     );
 }
 
 #[test]
 fn coerce_unsize_array() {
-    check_infer_with_mismatches(
+    check_types(
         r#"
 //- minicore: coerce_unsized
 fn test() {
     let f: &[usize] = &[1, 2, 3];
-}
-        "#,
-        expect![[r#"
-            10..47 '{     ... 3]; }': ()
-            20..21 'f': &[usize]
-            34..44 '&[1, 2, 3]': &[usize; 3]
-            35..44 '[1, 2, 3]': [usize; 3]
-            36..37 '1': usize
-            39..40 '2': usize
-            42..43 '3': usize
-        "#]],
+                      //^ usize
+}"#,
     );
 }
 
 #[test]
 fn coerce_unsize_trait_object_simple() {
-    check_infer_with_mismatches(
+    check_types(
         r#"
 //- minicore: coerce_unsized
 trait Foo<T, U> {}
@@ -662,88 +332,18 @@ impl<T, X> Baz<T, X> for S<T, X> {}
 
 fn test() {
     let obj: &dyn Baz<i8, i16> = &S;
+                                //^ S<i8, i16>
     let obj: &dyn Bar<_, i8, i16> = &S;
+                                   //^ S<i8, i16>
     let obj: &dyn Foo<i8, _> = &S;
-}
-"#,
-        expect![[r#"
-            236..351 '{     ... &S; }': ()
-            246..249 'obj': &dyn Baz<i8, i16>
-            271..273 '&S': &S<i8, i16>
-            272..273 'S': S<i8, i16>
-            283..286 'obj': &dyn Bar<usize, i8, i16>
-            311..313 '&S': &S<i8, i16>
-            312..313 'S': S<i8, i16>
-            323..326 'obj': &dyn Foo<i8, usize>
-            346..348 '&S': &S<i8, {unknown}>
-            347..348 'S': S<i8, {unknown}>
-        "#]],
-    );
-}
-
-#[test]
-fn coerce_unsize_trait_object_to_trait_object() {
-    // FIXME: The rust reference says this should be possible, but rustc doesn't
-    // implement it. We used to support it, but Chalk doesn't. Here's the
-    // correct expect:
-    //
-    //     424..609 '{     ...bj2; }': ()
-    //     434..437 'obj': &dyn Baz<i8, i16>
-    //     459..461 '&S': &S<i8, i16>
-    //     460..461 'S': S<i8, i16>
-    //     471..474 'obj': &dyn Bar<usize, i8, i16>
-    //     496..499 'obj': &dyn Baz<i8, i16>
-    //     509..512 'obj': &dyn Foo<i8, usize>
-    //     531..534 'obj': &dyn Bar<usize, i8, i16>
-    //     544..548 'obj2': &dyn Baz<i8, i16>
-    //     570..572 '&S': &S<i8, i16>
-    //     571..572 'S': S<i8, i16>
-    //     582..583 '_': &dyn Foo<i8, usize>
-    //     602..606 'obj2': &dyn Baz<i8, i16>
-    check_infer_with_mismatches(
-        r#"
-//- minicore: coerce_unsized
-trait Foo<T, U> {}
-trait Bar<U, T, X>: Foo<T, U> {}
-trait Baz<T, X>: Bar<usize, T, X> {}
-
-struct S<T, X>;
-impl<T, X> Foo<T, usize> for S<T, X> {}
-impl<T, X> Bar<usize, T, X> for S<T, X> {}
-impl<T, X> Baz<T, X> for S<T, X> {}
-
-fn test() {
-    let obj: &dyn Baz<i8, i16> = &S;
-    let obj: &dyn Bar<_, _, _> = obj;
-    let obj: &dyn Foo<_, _> = obj;
-    let obj2: &dyn Baz<i8, i16> = &S;
-    let _: &dyn Foo<_, _> = obj2;
-}
-"#,
-        expect![[r#"
-            236..421 '{     ...bj2; }': ()
-            246..249 'obj': &dyn Baz<i8, i16>
-            271..273 '&S': &S<i8, i16>
-            272..273 'S': S<i8, i16>
-            283..286 'obj': &dyn Bar<{unknown}, {unknown}, {unknown}>
-            308..311 'obj': &dyn Baz<i8, i16>
-            321..324 'obj': &dyn Foo<{unknown}, {unknown}>
-            343..346 'obj': &dyn Bar<{unknown}, {unknown}, {unknown}>
-            356..360 'obj2': &dyn Baz<i8, i16>
-            382..384 '&S': &S<i8, i16>
-            383..384 'S': S<i8, i16>
-            394..395 '_': &dyn Foo<{unknown}, {unknown}>
-            414..418 'obj2': &dyn Baz<i8, i16>
-            308..311: expected &dyn Bar<{unknown}, {unknown}, {unknown}>, got &dyn Baz<i8, i16>
-            343..346: expected &dyn Foo<{unknown}, {unknown}>, got &dyn Bar<{unknown}, {unknown}, {unknown}>
-            414..418: expected &dyn Foo<{unknown}, {unknown}>, got &dyn Baz<i8, i16>
-        "#]],
+                              //^ S<i8, {unknown}>
+}"#,
     );
 }
 
 #[test]
 fn coerce_unsize_super_trait_cycle() {
-    check_infer_with_mismatches(
+    check_no_mismatches(
         r#"
 //- minicore: coerce_unsized
 trait A {}
@@ -762,22 +362,13 @@ fn test() {
     let obj: &dyn A = &S;
 }
 "#,
-        expect![[r#"
-            140..195 '{     ... &S; }': ()
-            150..153 'obj': &dyn D
-            164..166 '&S': &S
-            165..166 'S': S
-            176..179 'obj': &dyn A
-            190..192 '&S': &S
-            191..192 'S': S
-        "#]],
     );
 }
 
 #[test]
 fn coerce_unsize_generic() {
     // FIXME: fix the type mismatches here
-    check_infer_with_mismatches(
+    check(
         r#"
 //- minicore: coerce_unsized
 struct Foo<T> { t: T };
@@ -785,73 +376,47 @@ struct Bar<T>(Foo<T>);
 
 fn test() {
     let _: &Foo<[usize]> = &Foo { t: [1, 2, 3] };
+                                   //^^^^^^^^^ expected [usize], got [usize; 3]
     let _: &Bar<[usize]> = &Bar(Foo { t: [1, 2, 3] });
+                         //^^^^^^^^^^^^^^^^^^^^^^^^^^ expected &Bar<[usize]>, got &Bar<[i32; 3]>
 }
 "#,
-        expect![[r#"
-            58..166 '{     ... }); }': ()
-            68..69 '_': &Foo<[usize]>
-            87..108 '&Foo {..., 3] }': &Foo<[usize]>
-            88..108 'Foo { ..., 3] }': Foo<[usize]>
-            97..106 '[1, 2, 3]': [usize; 3]
-            98..99 '1': usize
-            101..102 '2': usize
-            104..105 '3': usize
-            118..119 '_': &Bar<[usize]>
-            137..163 '&Bar(F... 3] })': &Bar<[i32; 3]>
-            138..141 'Bar': Bar<[i32; 3]>(Foo<[i32; 3]>) -> Bar<[i32; 3]>
-            138..163 'Bar(Fo... 3] })': Bar<[i32; 3]>
-            142..162 'Foo { ..., 3] }': Foo<[i32; 3]>
-            151..160 '[1, 2, 3]': [i32; 3]
-            152..153 '1': i32
-            155..156 '2': i32
-            158..159 '3': i32
-            97..106: expected [usize], got [usize; 3]
-            137..163: expected &Bar<[usize]>, got &Bar<[i32; 3]>
-        "#]],
     );
 }
 
 #[test]
 fn coerce_unsize_apit() {
     // FIXME: #8984
-    check_infer_with_mismatches(
+    check(
         r#"
 //- minicore: coerce_unsized
 trait Foo {}
 
 fn test(f: impl Foo) {
     let _: &dyn Foo = &f;
+                    //^^ expected &dyn Foo, got &impl Foo
 }
         "#,
-        expect![[r#"
-            22..23 'f': impl Foo
-            35..64 '{     ... &f; }': ()
-            45..46 '_': &dyn Foo
-            59..61 '&f': &impl Foo
-            60..61 'f': impl Foo
-            59..61: expected &dyn Foo, got &impl Foo
-        "#]],
     );
 }
 
 #[test]
-fn infer_two_closures_lub() {
+fn two_closures_lub() {
     check_types(
         r#"
 fn foo(c: i32) {
     let add = |a: i32, b: i32| a + b;
     let sub = |a, b| a - b;
-            //^ |i32, i32| -> i32
+            //^^^^^^^^^^^^ |i32, i32| -> i32
     if c > 42 { add } else { sub };
-  //^ fn(i32, i32) -> i32
+  //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ fn(i32, i32) -> i32
 }
         "#,
     )
 }
 
 #[test]
-fn infer_match_diverging_branch_1() {
+fn match_diverging_branch_1() {
     check_types(
         r#"
 enum Result<T> { Ok(T), Err }
@@ -870,7 +435,7 @@ fn test() -> i32 {
 }
 
 #[test]
-fn infer_match_diverging_branch_2() {
+fn match_diverging_branch_2() {
     // same as 1 except for order of branches
     check_types(
         r#"
diff --git a/crates/hir_ty/src/tests/display_source_code.rs b/crates/hir_ty/src/tests/display_source_code.rs
index 3d29021aa..058cd02d7 100644
--- a/crates/hir_ty/src/tests/display_source_code.rs
+++ b/crates/hir_ty/src/tests/display_source_code.rs
@@ -10,8 +10,8 @@ mod foo {
 
 fn bar() {
     let foo: foo::Foo = foo::Foo;
-    foo
-}  //^ foo::Foo
+    foo;
+} //^^^ foo::Foo
 
 "#,
     );
@@ -25,7 +25,7 @@ struct Foo<T = u8> { t: T }
 fn main() {
     let foo = Foo { t: 5u8 };
     foo;
-}  //^ Foo
+} //^^^ Foo
 "#,
     );
 
@@ -35,7 +35,7 @@ struct Foo<K, T = u8> { k: K, t: T }
 fn main() {
     let foo = Foo { k: 400, t: 5u8 };
     foo;
-}   //^ Foo<i32>
+} //^^^ Foo<i32>
 "#,
     );
 }
@@ -50,7 +50,7 @@ fn foo() -> *const (impl Unpin + Sized) { loop {} }
 fn main() {
     let foo = foo();
     foo;
-}   //^ *const (impl Unpin + Sized)
+} //^^^ *const (impl Unpin + Sized)
 "#,
     );
 }
diff --git a/crates/hir_ty/src/tests/macros.rs b/crates/hir_ty/src/tests/macros.rs
index d14103aab..2cf41e49e 100644
--- a/crates/hir_ty/src/tests/macros.rs
+++ b/crates/hir_ty/src/tests/macros.rs
@@ -435,11 +435,11 @@ fn processes_impls_generated_by_macros() {
 macro_rules! m {
     ($ident:ident) => (impl Trait for $ident {})
 }
-trait Trait { fn foo(self) -> u128 {} }
+trait Trait { fn foo(self) -> u128 { 0 } }
 struct S;
 m!(S);
 fn test() { S.foo(); }
-                //^ u128
+          //^^^^^^^ u128
 "#,
     );
 }
@@ -457,7 +457,7 @@ impl S {
 }
 
 fn test() { S.foo(); }
-                //^ u128
+          //^^^^^^^ u128
 "#,
     );
 }
@@ -479,7 +479,7 @@ impl S {
 }
 
 fn test() { S.foo(); }
-                //^ u128
+          //^^^^^^^ u128
 "#,
     );
 }
@@ -743,7 +743,7 @@ include!("foo.rs");
 
 fn main() {
     bar();
-}     //^ u32
+} //^^^^^ u32
 
 //- /foo.rs
 fn bar() -> u32 {0}
@@ -781,7 +781,7 @@ include!("f/foo.rs");
 
 fn main() {
     bar::bar();
-}          //^ u32
+} //^^^^^^^^^^ u32
 
 //- /f/foo.rs
 pub mod bar;
@@ -853,7 +853,7 @@ include!("foo.rs");
 
 fn main() {
     RegisterBlock { };
-                  //^ RegisterBlock
+  //^^^^^^^^^^^^^^^^^ RegisterBlock
 }
     "#;
     let fixture = format!("{}\n//- /foo.rs\n{}", fixture, data);
@@ -879,7 +879,7 @@ include!(concat!("f", "oo.rs"));
 
 fn main() {
     bar();
-}     //^ u32
+} //^^^^^ u32
 
 //- /foo.rs
 fn bar() -> u32 {0}
@@ -905,7 +905,7 @@ include!(concat!(env!("OUT_DIR"), "/foo.rs"));
 
 fn main() {
     bar();
-}     //^ {unknown}
+} //^^^^^ {unknown}
 
 //- /foo.rs
 fn bar() -> u32 {0}
@@ -923,7 +923,7 @@ macro_rules! include {() => {}}
 include!("main.rs");
 
 fn main() {
-            0
+    0;
 } //^ i32
 "#,
     );
@@ -979,7 +979,7 @@ fn infer_derive_clone_simple() {
 struct S;
 fn test() {
     S.clone();
-}         //^ S
+} //^^^^^^^^^ S
 
 //- /lib.rs crate:core
 pub mod prelude {
@@ -1028,7 +1028,7 @@ pub struct S;
 use core::S;
 fn test() {
     S.clone();
-}         //^ S
+} //^^^^^^^^^ S
 "#,
     );
 }
@@ -1044,7 +1044,8 @@ struct S;
 struct Wrapper<T>(T);
 struct NonClone;
 fn test() {
-    (Wrapper(S).clone(), Wrapper(NonClone).clone());
+    let x = (Wrapper(S).clone(), Wrapper(NonClone).clone());
+    x;
   //^ (Wrapper<S>, {unknown})
 }
 
@@ -1079,7 +1080,7 @@ struct S{}
 
 fn test() {
     S{};
-}   //^ S
+} //^^^ S
 "#,
     );
 }
diff --git a/crates/hir_ty/src/tests/method_resolution.rs b/crates/hir_ty/src/tests/method_resolution.rs
index d9b5ee9cf..3f7a37295 100644
--- a/crates/hir_ty/src/tests/method_resolution.rs
+++ b/crates/hir_ty/src/tests/method_resolution.rs
@@ -257,7 +257,7 @@ fn test() {
 mod foo {
     struct S;
     impl S {
-        fn thing() -> i128 {}
+        fn thing() -> i128 { 0 }
     }
 }
 "#,
@@ -267,164 +267,128 @@ mod foo {
 #[test]
 fn infer_trait_method_simple() {
     // the trait implementation is intentionally incomplete -- it shouldn't matter
-    check_infer(
+    check_types(
         r#"
-        trait Trait1 {
-            fn method(&self) -> u32;
-        }
-        struct S1;
-        impl Trait1 for S1 {}
-        trait Trait2 {
-            fn method(&self) -> i128;
-        }
-        struct S2;
-        impl Trait2 for S2 {}
-        fn test() {
-            S1.method(); // -> u32
-            S2.method(); // -> i128
-        }
+trait Trait1 {
+    fn method(&self) -> u32;
+}
+struct S1;
+impl Trait1 for S1 {}
+trait Trait2 {
+    fn method(&self) -> i128;
+}
+struct S2;
+impl Trait2 for S2 {}
+fn test() {
+    S1.method();
+  //^^^^^^^^^^^ u32
+    S2.method(); // -> i128
+  //^^^^^^^^^^^ i128
+}
         "#,
-        expect![[r#"
-            30..34 'self': &Self
-            109..113 'self': &Self
-            169..227 '{     ...i128 }': ()
-            175..177 'S1': S1
-            175..186 'S1.method()': u32
-            202..204 'S2': S2
-            202..213 'S2.method()': i128
-        "#]],
     );
 }
 
 #[test]
 fn infer_trait_method_scoped() {
     // the trait implementation is intentionally incomplete -- it shouldn't matter
-    check_infer(
+    check_types(
         r#"
-        struct S;
-        mod foo {
-            pub trait Trait1 {
-                fn method(&self) -> u32;
-            }
-            impl Trait1 for super::S {}
-        }
-        mod bar {
-            pub trait Trait2 {
-                fn method(&self) -> i128;
-            }
-            impl Trait2 for super::S {}
-        }
+struct S;
+mod foo {
+    pub trait Trait1 {
+        fn method(&self) -> u32;
+    }
+    impl Trait1 for super::S {}
+}
+mod bar {
+    pub trait Trait2 {
+        fn method(&self) -> i128;
+    }
+    impl Trait2 for super::S {}
+}
 
-        mod foo_test {
-            use super::S;
-            use super::foo::Trait1;
-            fn test() {
-                S.method(); // -> u32
-            }
-        }
+mod foo_test {
+    use super::S;
+    use super::foo::Trait1;
+    fn test() {
+        S.method();
+      //^^^^^^^^^^ u32
+    }
+}
 
-        mod bar_test {
-            use super::S;
-            use super::bar::Trait2;
-            fn test() {
-                S.method(); // -> i128
-            }
-        }
+mod bar_test {
+    use super::S;
+    use super::bar::Trait2;
+    fn test() {
+        S.method();
+      //^^^^^^^^^^ i128
+    }
+}
         "#,
-        expect![[r#"
-            62..66 'self': &Self
-            168..172 'self': &Self
-            299..336 '{     ...     }': ()
-            309..310 'S': S
-            309..319 'S.method()': u32
-            415..453 '{     ...     }': ()
-            425..426 'S': S
-            425..435 'S.method()': i128
-        "#]],
     );
 }
 
 #[test]
 fn infer_trait_method_generic_1() {
     // the trait implementation is intentionally incomplete -- it shouldn't matter
-    check_infer(
+    check_types(
         r#"
-        trait Trait<T> {
-            fn method(&self) -> T;
-        }
-        struct S;
-        impl Trait<u32> for S {}
-        fn test() {
-            S.method();
-        }
+trait Trait<T> {
+    fn method(&self) -> T;
+}
+struct S;
+impl Trait<u32> for S {}
+fn test() {
+    S.method();
+  //^^^^^^^^^^ u32
+}
         "#,
-        expect![[r#"
-            32..36 'self': &Self
-            91..110 '{     ...d(); }': ()
-            97..98 'S': S
-            97..107 'S.method()': u32
-        "#]],
     );
 }
 
 #[test]
 fn infer_trait_method_generic_more_params() {
     // the trait implementation is intentionally incomplete -- it shouldn't matter
-    check_infer(
+    check_types(
         r#"
-        trait Trait<T1, T2, T3> {
-            fn method1(&self) -> (T1, T2, T3);
-            fn method2(&self) -> (T3, T2, T1);
-        }
-        struct S1;
-        impl Trait<u8, u16, u32> for S1 {}
-        struct S2;
-        impl<T> Trait<i8, i16, T> for S2 {}
-        fn test() {
-            S1.method1(); // u8, u16, u32
-            S1.method2(); // u32, u16, u8
-            S2.method1(); // i8, i16, {unknown}
-            S2.method2(); // {unknown}, i16, i8
-        }
+trait Trait<T1, T2, T3> {
+    fn method1(&self) -> (T1, T2, T3);
+    fn method2(&self) -> (T3, T2, T1);
+}
+struct S1;
+impl Trait<u8, u16, u32> for S1 {}
+struct S2;
+impl<T> Trait<i8, i16, T> for S2 {}
+fn test() {
+    S1.method1();
+  //^^^^^^^^^^^^ (u8, u16, u32)
+    S1.method2();
+  //^^^^^^^^^^^^ (u32, u16, u8)
+    S2.method1();
+  //^^^^^^^^^^^^ (i8, i16, {unknown})
+    S2.method2();
+  //^^^^^^^^^^^^ ({unknown}, i16, i8)
+}
         "#,
-        expect![[r#"
-            42..46 'self': &Self
-            81..85 'self': &Self
-            209..360 '{     ..., i8 }': ()
-            215..217 'S1': S1
-            215..227 'S1.method1()': (u8, u16, u32)
-            249..251 'S1': S1
-            249..261 'S1.method2()': (u32, u16, u8)
-            283..285 'S2': S2
-            283..295 'S2.method1()': (i8, i16, {unknown})
-            323..325 'S2': S2
-            323..335 'S2.method2()': ({unknown}, i16, i8)
-        "#]],
     );
 }
 
 #[test]
 fn infer_trait_method_generic_2() {
     // the trait implementation is intentionally incomplete -- it shouldn't matter
-    check_infer(
+    check_types(
         r#"
-        trait Trait<T> {
-            fn method(&self) -> T;
-        }
-        struct S<T>(T);
-        impl<U> Trait<U> for S<U> {}
-        fn test() {
-            S(1u32).method();
-        }
+trait Trait<T> {
+    fn method(&self) -> T;
+}
+struct S<T>(T);
+impl<U> Trait<U> for S<U> {}
+fn test() {
+    S(1u32).method();
+  //^^^^^^^^^^^^^^^^ u32
+}
         "#,
-        expect![[r#"
-            32..36 'self': &Self
-            101..126 '{     ...d(); }': ()
-            107..108 'S': S<u32>(u32) -> S<u32>
-            107..114 'S(1u32)': S<u32>
-            107..123 'S(1u32...thod()': u32
-            109..113 '1u32': u32
-        "#]],
     );
 }
 
@@ -685,10 +649,10 @@ fn method_resolution_unify_impl_self_type() {
     check_types(
         r#"
 struct S<T>;
-impl S<u32> { fn foo(&self) -> u8 {} }
-impl S<i32> { fn foo(&self) -> i8 {} }
+impl S<u32> { fn foo(&self) -> u8 { 0 } }
+impl S<i32> { fn foo(&self) -> i8 { 0 } }
 fn test() { (S::<u32>.foo(), S::<i32>.foo()); }
-          //^ (u8, i8)
+          //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (u8, i8)
 "#,
     );
 }
@@ -702,7 +666,7 @@ struct S;
 impl S { fn foo(&self) -> i8 { 0 } }
 impl Trait for S { fn foo(self) -> u128 { 0 } }
 fn test() { S.foo(); }
-                //^ u128
+          //^^^^^^^ u128
 "#,
     );
 }
@@ -716,7 +680,7 @@ struct S;
 impl Clone for S {}
 impl Clone for &S {}
 fn test() { (S.clone(), (&S).clone(), (&&S).clone()); }
-          //^ (S, S, &S)
+          //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (S, S, &S)
 "#,
     );
 }
@@ -730,7 +694,7 @@ struct S;
 impl S { fn foo(self) -> i8 { 0 } }
 impl Trait for &S { fn foo(self) -> u128 { 0 } }
 fn test() { (&S).foo(); }
-                   //^ u128
+          //^^^^^^^^^^ u128
 "#,
     );
 }
@@ -744,7 +708,7 @@ struct S;
 impl S { fn foo(self) -> i8 { 0 } }
 impl Trait for S { fn foo(self) -> u128 { 0 } }
 fn test() { S.foo(); }
-                //^ i8
+          //^^^^^^^ i8
 "#,
     );
 }
@@ -758,7 +722,7 @@ struct S;
 impl S { fn foo(&self) -> i8 { 0 } }
 impl Trait for &S { fn foo(self) -> u128 { 0 } }
 fn test() { S.foo(); }
-                //^ i8
+          //^^^^^^^ i8
 "#,
     );
 }
@@ -771,7 +735,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl Trait for S { fn foo(self) -> u128 { 0 } }
 fn test() { (&S).foo(); }
-                   //^ u128
+          //^^^^^^^^^^ u128
 "#,
     );
 }
@@ -784,7 +748,7 @@ fn method_resolution_unsize_array() {
 fn test() {
     let a = [1, 2, 3];
     a.len();
-}       //^ usize
+} //^^^^^^^ usize
 "#,
     );
 }
@@ -799,7 +763,7 @@ impl Clone for S {}
 
 fn test() {
     S.clone();
-          //^ S
+  //^^^^^^^^^ S
 }
 
 //- /lib.rs crate:core
@@ -823,7 +787,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl<T> Trait for T where T: UnknownTrait {}
 fn test() { (&S).foo(); }
-                   //^ u128
+          //^^^^^^^^^^ u128
 "#,
     );
 }
@@ -841,7 +805,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl<T> Trait for T where T: Clone {}
 fn test() { (&S).foo(); }
-                   //^ {unknown}
+          //^^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -856,7 +820,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl<T: Clone> Trait for T {}
 fn test() { (&S).foo(); }
-                   //^ {unknown}
+          //^^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -871,7 +835,7 @@ struct S;
 impl Clone for S {}
 impl<T> Trait for T where T: Clone {}
 fn test() { S.foo(); }
-                //^ u128
+          //^^^^^^^ u128
 "#,
     );
 }
@@ -887,7 +851,7 @@ struct S2;
 impl From<S2> for S1 {}
 impl<T, U> Into<U> for T where U: From<T> {}
 fn test() { S2.into(); }
-                  //^ {unknown}
+          //^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -903,7 +867,7 @@ struct S2;
 impl From<S2> for S1 {}
 impl<T, U: From<T>> Into<U> for T {}
 fn test() { S2.into(); }
-                  //^ {unknown}
+          //^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -933,7 +897,7 @@ fn main() {
     let a = Wrapper::<Foo<f32>>::new(1.0);
     let b = Wrapper::<Bar<f32>>::new(1.0);
     (a, b);
-  //^ (Wrapper<Foo<f32>>, Wrapper<Bar<f32>>)
+  //^^^^^^ (Wrapper<Foo<f32>>, Wrapper<Bar<f32>>)
 }
 "#,
     );
@@ -947,7 +911,7 @@ fn method_resolution_encountering_fn_type() {
 fn foo() {}
 trait FnOnce { fn call(self); }
 fn test() { foo.call(); }
-                   //^ {unknown}
+          //^^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -1013,7 +977,7 @@ where
     Wrapper<T>: a::Foo,
 {
     t.foo();
-}       //^ {unknown}
+} //^^^^^^^ {unknown}
 "#,
     );
 }
@@ -1030,7 +994,7 @@ impl A<i32> {
 
 fn main() {
     A::from(3);
-}          //^ A<i32>
+} //^^^^^^^^^^ A<i32>
 "#,
     );
 }
@@ -1058,7 +1022,7 @@ trait FnX {}
 impl<B, C> Trait for S<B, C> where C: FnX, B: SendX {}
 
 fn test() { (S {}).method(); }
-                        //^ ()
+          //^^^^^^^^^^^^^^^ ()
 "#,
     );
 }
@@ -1143,8 +1107,8 @@ impl<T> Slice<T> {
 
 fn main() {
     let foo: Slice<u32>;
-    (foo.into_vec()); // we don't actually support arbitrary self types, but we shouldn't crash at least
-} //^ {unknown}
+    foo.into_vec(); // we shouldn't crash on this at least
+} //^^^^^^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -1165,7 +1129,7 @@ impl dyn Foo + '_ {
 fn main() {
     let f = &42u32 as &dyn Foo;
     f.dyn_foo();
-  // ^u32
+ // ^^^^^^^^^^^ u32
 }
 "#,
     );
@@ -1376,11 +1340,11 @@ pub trait IntoIterator {
 
 impl<T> IntoIterator for [T; 1] {
     type Out = T;
-    fn into_iter(self) -> Self::Out {}
+    fn into_iter(self) -> Self::Out { loop {} }
 }
 impl<'a, T> IntoIterator for &'a [T] {
     type Out = &'a T;
-    fn into_iter(self) -> Self::Out {}
+    fn into_iter(self) -> Self::Out { loop {} }
 }
     "#,
     );
diff --git a/crates/hir_ty/src/tests/patterns.rs b/crates/hir_ty/src/tests/patterns.rs
index 5adbe9c45..47aa30d2e 100644
--- a/crates/hir_ty/src/tests/patterns.rs
+++ b/crates/hir_ty/src/tests/patterns.rs
@@ -1,6 +1,6 @@
 use expect_test::expect;
 
-use super::{check_infer, check_infer_with_mismatches, check_mismatches, check_types};
+use super::{check, check_infer, check_infer_with_mismatches, check_types};
 
 #[test]
 fn infer_pattern() {
@@ -518,7 +518,7 @@ fn infer_generics_in_patterns() {
 
 #[test]
 fn infer_const_pattern() {
-    check_mismatches(
+    check(
         r#"
 enum Option<T> { None }
 use Option::None;
diff --git a/crates/hir_ty/src/tests/regression.rs b/crates/hir_ty/src/tests/regression.rs
index 0f418ea49..8c5e8954c 100644
--- a/crates/hir_ty/src/tests/regression.rs
+++ b/crates/hir_ty/src/tests/regression.rs
@@ -1,6 +1,6 @@
 use expect_test::expect;
 
-use super::{check_infer, check_types};
+use super::{check_infer, check_no_mismatches, check_types};
 
 #[test]
 fn bug_484() {
@@ -422,20 +422,20 @@ fn issue_2683_chars_impl() {
 pub struct Chars<'a> {}
 impl<'a> Iterator for Chars<'a> {
     type Item = char;
-    fn next(&mut self) -> Option<char> {}
+    fn next(&mut self) -> Option<char> { loop {} }
 }
 
 fn test() {
     let chars: Chars<'_>;
     (chars.next(), chars.nth(1));
-} //^ (Option<char>, Option<char>)
+} //^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (Option<char>, Option<char>)
 "#,
     );
 }
 
 #[test]
 fn issue_3642_bad_macro_stackover() {
-    check_types(
+    check_no_mismatches(
         r#"
 #[macro_export]
 macro_rules! match_ast {
@@ -452,7 +452,6 @@ macro_rules! match_ast {
 
 fn main() {
     let anchor = match_ast! {
-       //^ ()
         match parent {
             as => {},
             _ => return None
@@ -956,7 +955,7 @@ trait IterTrait<'a, T: 'a>: Iterator<Item = &'a T> {
 
 fn clone_iter<T>(s: Iter<T>) {
     s.inner.clone_box();
-    //^^^^^^^^^^^^^^^^^^^ ()
+  //^^^^^^^^^^^^^^^^^^^ ()
 }
 "#,
     )
diff --git a/crates/hir_ty/src/tests/simple.rs b/crates/hir_ty/src/tests/simple.rs
index 108ff3179..b4bcc6d95 100644
--- a/crates/hir_ty/src/tests/simple.rs
+++ b/crates/hir_ty/src/tests/simple.rs
@@ -60,7 +60,7 @@ enum Nat { Succ(Self), Demo(Nat), Zero }
 fn test() {
     let foo: Nat = Nat::Zero;
     if let Nat::Succ(x) = foo {
-        x
+        x;
     } //^ Nat
 }
 "#,
@@ -138,7 +138,7 @@ enum Option<T> { Some(T), None }
 fn test() {
     let foo: Option<f32> = None;
     while let Option::Some(x) = foo {
-        x
+        x;
     } //^ f32
 }
 "#,
@@ -1745,7 +1745,7 @@ impl i32 { fn foo(&self) -> Foo { Foo } }
 fn main() {
     let x: i32 = i32;
     x.foo();
-        //^ Foo
+  //^^^^^^^ Foo
 }"#,
     );
 }
@@ -1763,7 +1763,7 @@ fn main() {
     fn inner() {}
     let x: i32 = i32;
     x.foo();
-        //^ Foo
+  //^^^^^^^ Foo
 }"#,
     );
 }
@@ -1781,7 +1781,7 @@ fn foo() -> &'static str { "" }
 
 fn main() {
     foo();
-      //^ &str
+  //^^^^^ &str
 }"#,
     );
 }
@@ -1799,7 +1799,7 @@ fn foo() -> &'static str { "" }
 
 fn main() {
     str::foo();
-           //^ u32
+  //^^^^^^^^^^ u32
 }"#,
     );
 }
@@ -1825,9 +1825,9 @@ mod d {
 
 fn main() {
     d::foo();
-         //^ u8
+  //^^^^^^^^ u8
     d::foo{a:0};
-           //^ u8
+  //^^^^^^^^^^^ foo
 }"#,
     );
 }
@@ -2677,7 +2677,7 @@ fn prelude_2015() {
 //- /main.rs edition:2015 crate:main deps:core
 fn f() {
     Rust;
-     //^ Rust
+  //^^^^ Rust
 }
 
 //- /core.rs crate:core
diff --git a/crates/hir_ty/src/tests/traits.rs b/crates/hir_ty/src/tests/traits.rs
index 279a1354a..a0ddad570 100644
--- a/crates/hir_ty/src/tests/traits.rs
+++ b/crates/hir_ty/src/tests/traits.rs
@@ -1,6 +1,7 @@
+use cov_mark::check;
 use expect_test::expect;
 
-use super::{check_infer, check_infer_with_mismatches, check_types};
+use super::{check, check_infer, check_infer_with_mismatches, check_types};
 
 #[test]
 fn infer_await() {
@@ -285,7 +286,7 @@ mod ops {
 
 #[test]
 fn infer_from_bound_1() {
-    check_infer(
+    check_types(
         r#"
 trait Trait<T> {}
 struct S<T>(T);
@@ -293,99 +294,62 @@ impl<U> Trait<U> for S<U> {}
 fn foo<T: Trait<u32>>(t: T) {}
 fn test() {
     let s = S(unknown);
+           // ^^^^^^^ u32
     foo(s);
 }"#,
-        expect![[r#"
-            85..86 't': T
-            91..93 '{}': ()
-            104..143 '{     ...(s); }': ()
-            114..115 's': S<u32>
-            118..119 'S': S<u32>(u32) -> S<u32>
-            118..128 'S(unknown)': S<u32>
-            120..127 'unknown': u32
-            134..137 'foo': fn foo<S<u32>>(S<u32>)
-            134..140 'foo(s)': ()
-            138..139 's': S<u32>
-        "#]],
     );
 }
 
 #[test]
 fn infer_from_bound_2() {
-    check_infer(
+    check_types(
         r#"
 trait Trait<T> {}
 struct S<T>(T);
 impl<U> Trait<U> for S<U> {}
-fn foo<U, T: Trait<U>>(t: T) -> U {}
+fn foo<U, T: Trait<U>>(t: T) -> U { loop {} }
 fn test() {
     let s = S(unknown);
+           // ^^^^^^^ u32
     let x: u32 = foo(s);
 }"#,
-        expect![[r#"
-            86..87 't': T
-            97..99 '{}': ()
-            110..162 '{     ...(s); }': ()
-            120..121 's': S<u32>
-            124..125 'S': S<u32>(u32) -> S<u32>
-            124..134 'S(unknown)': S<u32>
-            126..133 'unknown': u32
-            144..145 'x': u32
-            153..156 'foo': fn foo<u32, S<u32>>(S<u32>) -> u32
-            153..159 'foo(s)': u32
-            157..158 's': S<u32>
-        "#]],
     );
 }
 
 #[test]
 fn trait_default_method_self_bound_implements_trait() {
     cov_mark::check!(trait_self_implements_self);
-    check_infer(
+    check(
         r#"
 trait Trait {
     fn foo(&self) -> i64;
-    fn bar(&self) -> {
-        let x = self.foo();
+    fn bar(&self) -> () {
+        self.foo();
+     // ^^^^^^^^^^ type: i64
     }
 }"#,
-        expect![[r#"
-            26..30 'self': &Self
-            52..56 'self': &Self
-            61..96 '{     ...     }': ()
-            75..76 'x': i64
-            79..83 'self': &Self
-            79..89 'self.foo()': i64
-        "#]],
     );
 }
 
 #[test]
 fn trait_default_method_self_bound_implements_super_trait() {
-    check_infer(
+    check(
         r#"
 trait SuperTrait {
     fn foo(&self) -> i64;
 }
 trait Trait: SuperTrait {
-    fn bar(&self) -> {
-        let x = self.foo();
+    fn bar(&self) -> () {
+        self.foo();
+     // ^^^^^^^^^^ type: i64
     }
 }"#,
-        expect![[r#"
-            31..35 'self': &Self
-            85..89 'self': &Self
-            94..129 '{     ...     }': ()
-            108..109 'x': i64
-            112..116 'self': &Self
-            112..122 'self.foo()': i64
-        "#]],
     );
 }
 
 #[test]
 fn infer_project_associated_type() {
-    check_infer(
+    check_types(
         r#"
 trait Iterable {
     type Item;
@@ -394,89 +358,62 @@ struct S;
 impl Iterable for S { type Item = u32; }
 fn test<T: Iterable>() {
     let x: <S as Iterable>::Item = 1;
-    let y: <T as Iterable>::Item = no_matter;
-    let z: T::Item = no_matter;
-    let a: <T>::Item = no_matter;
+                                // ^ u32
+    let y: <T as Iterable>::Item = u;
+                                // ^ Iterable::Item<T>
+    let z: T::Item = u;
+                  // ^ Iterable::Item<T>
+    let a: <T>::Item = u;
+                    // ^ Iterable::Item<T>
 }"#,
-        expect![[r#"
-            108..261 '{     ...ter; }': ()
-            118..119 'x': u32
-            145..146 '1': u32
-            156..157 'y': Iterable::Item<T>
-            183..192 'no_matter': Iterable::Item<T>
-            202..203 'z': Iterable::Item<T>
-            215..224 'no_matter': Iterable::Item<T>
-            234..235 'a': Iterable::Item<T>
-            249..258 'no_matter': Iterable::Item<T>
-        "#]],
     );
 }
 
 #[test]
 fn infer_return_associated_type() {
-    check_infer(
+    check_types(
         r#"
 trait Iterable {
     type Item;
 }
 struct S;
 impl Iterable for S { type Item = u32; }
-fn foo1<T: Iterable>(t: T) -> T::Item {}
-fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item {}
-fn foo3<T: Iterable>(t: T) -> <T>::Item {}
+fn foo1<T: Iterable>(t: T) -> T::Item { loop {} }
+fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item { loop {} }
+fn foo3<T: Iterable>(t: T) -> <T>::Item { loop {} }
 fn test() {
-    let x = foo1(S);
-    let y = foo2(S);
-    let z = foo3(S);
+    foo1(S);
+ // ^^^^^^^ u32
+    foo2(S);
+ // ^^^^^^^ u32
+    foo3(S);
+ // ^^^^^^^ u32
 }"#,
-        expect![[r#"
-            106..107 't': T
-            123..125 '{}': ()
-            147..148 't': T
-            178..180 '{}': ()
-            202..203 't': T
-            221..223 '{}': ()
-            234..300 '{     ...(S); }': ()
-            244..245 'x': u32
-            248..252 'foo1': fn foo1<S>(S) -> <S as Iterable>::Item
-            248..255 'foo1(S)': u32
-            253..254 'S': S
-            265..266 'y': u32
-            269..273 'foo2': fn foo2<S>(S) -> <S as Iterable>::Item
-            269..276 'foo2(S)': u32
-            274..275 'S': S
-            286..287 'z': u32
-            290..294 'foo3': fn foo3<S>(S) -> <S as Iterable>::Item
-            290..297 'foo3(S)': u32
-            295..296 'S': S
-        "#]],
     );
 }
 
 #[test]
 fn infer_associated_type_bound() {
-    check_infer(
+    check_types(
         r#"
 trait Iterable {
     type Item;
 }
 fn test<T: Iterable<Item=u32>>() {
     let y: T::Item = unknown;
+                  // ^^^^^^^ u32
 }"#,
-        expect![[r#"
-            67..100 '{     ...own; }': ()
-            77..78 'y': u32
-            90..97 'unknown': u32
-        "#]],
     );
 }
 
 #[test]
 fn infer_const_body() {
+    // FIXME make check_types work with other bodies
     check_infer(
         r#"
 const A: u32 = 1 + 1;
-static B: u64 = { let x = 1; x };"#,
+static B: u64 = { let x = 1; x };
+"#,
         expect![[r#"
             15..16 '1': u32
             15..20 '1 + 1': u32
@@ -637,12 +574,12 @@ impl<T> core::ops::Deref for Arc<T> {
 
 struct S;
 impl S {
-    fn foo(&self) -> u128 {}
+    fn foo(&self) -> u128 { 0 }
 }
 
 fn test(s: Arc<S>) {
     (*s, s.foo());
-} //^ (S, u128)
+} //^^^^^^^^^^^^^ (S, u128)
 "#,
     );
 }
@@ -653,7 +590,7 @@ fn deref_trait_with_inference_var() {
         r#"
 //- minicore: deref
 struct Arc<T>;
-fn new_arc<T>() -> Arc<T> {}
+fn new_arc<T>() -> Arc<T> { Arc }
 impl<T> core::ops::Deref for Arc<T> {
     type Target = T;
 }
@@ -663,8 +600,8 @@ fn foo(a: Arc<S>) {}
 
 fn test() {
     let a = new_arc();
-    let b = (*a);
-          //^ S
+    let b = *a;
+          //^^ S
     foo(a);
 }
 "#,
@@ -684,7 +621,7 @@ impl core::ops::Deref for S {
 
 fn test(s: S) {
     s.foo();
-}       //^ {unknown}
+} //^^^^^^^ {unknown}
 "#,
     );
 }
@@ -701,12 +638,12 @@ impl<T: ?Sized> core::ops::Deref for Arc<T> {
 
 struct S;
 impl S {
-    fn foo(&self) -> u128 {}
+    fn foo(&self) -> u128 { 0 }
 }
 
 fn test(s: Arc<S>) {
     (*s, s.foo());
-} //^ (S, u128)
+} //^^^^^^^^^^^^^ (S, u128)
 "#,
     );
 }
@@ -720,11 +657,11 @@ struct S;
 trait Trait<T> {}
 impl Trait<u32> for S {}
 
-fn foo<T: Trait<U>, U>(t: T) -> U {}
+fn foo<T: Trait<U>, U>(t: T) -> U { loop {} }
 
 fn test(s: S) {
-    (foo(s));
-} //^ u32
+    foo(s);
+} //^^^^^^ u32
 "#,
     );
 }
@@ -741,12 +678,12 @@ impl Trait<isize> for S {}
 
 struct O;
 impl O {
-    fn foo<T: Trait<U>, U>(&self, t: T) -> U {}
+    fn foo<T: Trait<U>, U>(&self, t: T) -> U { loop {} }
 }
 
 fn test() {
     O.foo(S);
-}      //^ isize
+} //^^^^^^^^ isize
 "#,
     );
 }
@@ -761,12 +698,12 @@ trait Trait<T> {}
 impl Trait<i64> for S {}
 
 impl S {
-    fn foo<U>(&self) -> U where Self: Trait<U> {}
+    fn foo<U>(&self) -> U where Self: Trait<U> { loop {} }
 }
 
 fn test() {
     S.foo();
-}       //^ i64
+} //^^^^^^^ i64
 "#,
     );
 }
@@ -782,12 +719,12 @@ impl Trait<&str> for S {}
 
 struct O<T>;
 impl<U, T: Trait<U>> O<T> {
-    fn foo(&self) -> U {}
+    fn foo(&self) -> U { loop {} }
 }
 
 fn test(o: O<S>) {
     o.foo();
-}       //^ &str
+} //^^^^^^^ &str
 "#,
     );
 }
@@ -802,7 +739,7 @@ struct S;
 impl Clone for S {}
 impl<T> Trait for T where T: Clone {}
 fn test<T: Clone>(t: T) { t.foo(); }
-                             //^ u128
+                        //^^^^^^^ u128
 "#,
     );
 }
@@ -818,7 +755,7 @@ struct S;
 impl Clone for S {}
 impl<T> Trait for T where T: Clone {}
 fn test<T>(t: T) { t.foo(); }
-                       //^ {unknown}
+                 //^^^^^^^ {unknown}
 "#,
     );
 }
@@ -831,7 +768,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl Trait for S {}
 fn test<T: Trait>(t: T) { t.foo(); }
-                              //^ u128
+                        //^^^^^^^ u128
 "#,
     );
 }
@@ -844,7 +781,7 @@ trait Trait { fn foo(self) -> u128; }
 struct S;
 impl Trait for S {}
 fn test<T>(t: T) { t.foo(); }
-                       //^ {unknown}
+                 //^^^^^^^ {unknown}
 "#,
     );
 }
@@ -858,8 +795,8 @@ trait Trait {}
 impl<T> core::ops::Deref for T where T: Trait {
     type Target = i128;
 }
-fn test<T: Trait>(t: T) { (*t); }
-                        //^ i128
+fn test<T: Trait>(t: T) { *t; }
+                        //^^ i128
 "#,
     );
 }
@@ -1380,12 +1317,12 @@ fn error_bound_chalk() {
     check_types(
         r#"
 trait Trait {
-    fn foo(&self) -> u32 {}
+    fn foo(&self) -> u32 { 0 }
 }
 
 fn test(x: (impl Trait + UnknownTrait)) {
     x.foo();
-}       //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -1476,7 +1413,7 @@ trait Clone {
 fn api_walkthrough() {
     for node in foo() {
         node.clone();
-    }            //^ {unknown}
+    } //^^^^^^^^^^^^ {unknown}
 }
 "#,
     );
@@ -1513,13 +1450,13 @@ fn where_clause_trait_in_scope_for_method_resolution() {
         r#"
 mod foo {
     trait Trait {
-        fn foo(&self) -> u32 {}
+        fn foo(&self) -> u32 { 0 }
     }
 }
 
 fn test<T: foo::Trait>(x: T) {
     x.foo();
-}      //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -1982,7 +1919,7 @@ fn fn_item_fn_trait() {
 //- minicore: fn
 struct S;
 
-fn foo() -> S {}
+fn foo() -> S { S }
 
 fn takes_closure<U, F: FnOnce() -> U>(f: F) -> U { f() }
 
@@ -2009,7 +1946,7 @@ trait Trait2 {
 fn test<T: Trait>() where T::Item: Trait2 {
     let x: T::Item = no_matter;
     x.foo();
-}       //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -2029,7 +1966,7 @@ trait Trait2 {
 fn test<T, U>() where T::Item: Trait2, T: Trait<U::Item>, U: Trait<()> {
     let x: T::Item = no_matter;
     x.foo();
-}       //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -2092,7 +2029,7 @@ impl Trait for S {
 
 fn test() {
     S.f();
-}     //^ u32
+} //^^^^^ u32
 "#,
     );
 }
@@ -2120,7 +2057,7 @@ where
 
 fn foo<I: Interner>(interner: &I, t: Ty<I>) {
     fold(interner, t);
-}     //^ Ty<I>
+} //^^^^^^^^^^^^^^^^^ Ty<I>
 "#,
     );
 }
@@ -2139,7 +2076,7 @@ impl Trait<Self> for S {}
 
 fn test() {
     S.foo();
-}       //^ ()
+} //^^^^^^^ ()
 "#,
     );
 }
@@ -2158,7 +2095,7 @@ impl Trait for S<Self> {}
 
 fn test() {
     S.foo();
-}       //^ {unknown}
+} //^^^^^^^ {unknown}
 "#,
     );
 }
@@ -2176,7 +2113,7 @@ trait Trait2<T> {}
 
 fn test<T: Trait>() where T: Trait2<T::Item> {
     let x: T::Item = no_matter;
-}                       //^ {unknown}
+}                  //^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -2193,7 +2130,7 @@ trait Trait<T> {
 
 fn test<T, U>() where T: Trait<U::Item>, U: Trait<T::Item> {
     let x: T::Item = no_matter;
-}                   //^ {unknown}
+}                  //^^^^^^^^^ {unknown}
 "#,
     );
 }
@@ -2211,7 +2148,7 @@ trait Trait {
 
 fn test<T>() where T: Trait<OtherItem = T::Item> {
     let x: T::Item = no_matter;
-}                   //^ Trait::Item<T>
+}                  //^^^^^^^^^ Trait::Item<T>
 "#,
     );
 }
@@ -2243,7 +2180,7 @@ fn test<T>(t: T) where T: UnificationStoreMut {
     t.push(x);
     let y: Key<T>;
     (x, y);
-}      //^ (UnificationStoreBase::Key<T>, UnificationStoreBase::Key<T>)
+} //^^^^^^ (UnificationStoreBase::Key<T>, UnificationStoreBase::Key<T>)
 "#,
     );
 }
@@ -2268,7 +2205,7 @@ impl<T: Iterator> Iterator for S<T> {
 fn test<I: Iterator<Item: OtherTrait<u32>>>() {
     let x: <S<I> as Iterator>::Item;
     x.foo();
-}       //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -2470,7 +2407,7 @@ impl<T: Trait> Trait for S<T> {
 fn test<T: Trait>() {
     let y: <S<T> as Trait>::Item = no_matter;
     y.foo();
-}       //^ u32
+} //^^^^^^^ u32
 "#,
     );
 }
@@ -2490,7 +2427,7 @@ trait Trait {
 
 fn test(x: Box<dyn Trait>) {
     x.foo();
-}       //^ ()
+} //^^^^^^^ ()
 "#,
     );
 }
@@ -2509,7 +2446,7 @@ impl ToOwned for str {
 }
 fn test() {
     "foo".to_owned();
-}               //^ String
+} //^^^^^^^^^^^^^^^^ String
 "#,
     );
 }
@@ -2649,7 +2586,7 @@ impl<T:A> B for T {
 
 fn main() {
     Bar::foo();
-}          //^ Foo
+} //^^^^^^^^^^ Foo
 "#,
     );
 }
@@ -3002,7 +2939,7 @@ fn test() {
     S.get(1);
   //^^^^^^^^ u128
     S.get(1.);
-  //^^^^^^^^ f32
+  //^^^^^^^^^ f32
 }
         "#,
     );
@@ -3477,14 +3414,12 @@ trait Convert {
     fn new() -> Self;
 }
 impl Convert for u32 {
-    fn new() -> Self {
-        0
-    }
+    fn new() -> Self { 0 }
 }
 
 async fn get_accounts() -> Result<u32, ()> {
     let ret = Fooey.collect();
-    //                      ^ u32
+    //        ^^^^^^^^^^^^^^^ u32
     Ok(ret)
 }
 "#,
@@ -3493,6 +3428,7 @@ async fn get_accounts() -> Result<u32, ()> {
 
 #[test]
 fn local_impl_1() {
+    check!(block_local_impls);
     check_types(
         r#"
 trait Trait<T> {
@@ -3502,7 +3438,7 @@ trait Trait<T> {
 fn test() {
     struct S;
     impl Trait<u32> for S {
-        fn foo(&self) { 0 }
+        fn foo(&self) -> u32 { 0 }
     }
 
     S.foo();
@@ -3514,6 +3450,7 @@ fn test() {
 
 #[test]
 fn local_impl_2() {
+    check!(block_local_impls);
     check_types(
         r#"
 struct S;
@@ -3523,7 +3460,7 @@ fn test() {
         fn foo(&self) -> T;
     }
     impl Trait<u32> for S {
-        fn foo(&self) { 0 }
+        fn foo(&self) -> u32 { 0 }
     }
 
     S.foo();
@@ -3535,6 +3472,7 @@ fn test() {
 
 #[test]
 fn local_impl_3() {
+    check!(block_local_impls);
     check_types(
         r#"
 trait Trait<T> {
@@ -3547,7 +3485,7 @@ fn test() {
         struct S2;
 
         impl Trait<S1> for S2 {
-            fn foo(&self) { S1 }
+            fn foo(&self) -> S1 { S1 }
         }
 
         S2.foo();
diff --git a/crates/test_utils/src/lib.rs b/crates/test_utils/src/lib.rs
index d55bae62a..d9c22c180 100644
--- a/crates/test_utils/src/lib.rs
+++ b/crates/test_utils/src/lib.rs
@@ -11,6 +11,7 @@ mod fixture;
 mod assert_linear;
 
 use std::{
+    collections::BTreeMap,
     convert::{TryFrom, TryInto},
     env, fs,
     path::{Path, PathBuf},
@@ -205,14 +206,25 @@ pub fn add_cursor(text: &str, offset: TextSize) -> String {
 ///
 /// // ^^^ first line
 /// //   | second line
+///
+/// Annotations point to the last line that actually was long enough for the
+/// range, not counting annotations themselves. So overlapping annotations are
+/// possible:
+/// ```no_run
+/// // stuff        other stuff
+/// // ^^ 'st'
+/// // ^^^^^ 'stuff'
+/// //              ^^^^^^^^^^^ 'other stuff'
+/// ```
 pub fn extract_annotations(text: &str) -> Vec<(TextRange, String)> {
     let mut res = Vec::new();
-    let mut prev_line_start: Option<TextSize> = Some(0.into());
+    // map from line length to beginning of last line that had that length
+    let mut line_start_map = BTreeMap::new();
     let mut line_start: TextSize = 0.into();
     let mut prev_line_annotations: Vec<(TextSize, usize)> = Vec::new();
     for line in text.split_inclusive('\n') {
         let mut this_line_annotations = Vec::new();
-        if let Some(idx) = line.find("//") {
+        let line_length = if let Some(idx) = line.find("//") {
             let annotation_offset = TextSize::of(&line[..idx + "//".len()]);
             for annotation in extract_line_annotations(&line[idx + "//".len()..]) {
                 match annotation {
@@ -222,7 +234,9 @@ pub fn extract_annotations(text: &str) -> Vec<(TextRange, String)> {
                         let range = if file {
                             TextRange::up_to(TextSize::of(text))
                         } else {
-                            range + prev_line_start.unwrap()
+                            let line_start = line_start_map.range(range.end()..).next().unwrap();
+
+                            range + line_start.1
                         };
                         res.push((range, content))
                     }
@@ -238,9 +252,14 @@ pub fn extract_annotations(text: &str) -> Vec<(TextRange, String)> {
                     }
                 }
             }
-        }
+            idx.try_into().unwrap()
+        } else {
+            TextSize::of(line)
+        };
+
+        line_start_map = line_start_map.split_off(&line_length);
+        line_start_map.insert(line_length, line_start);
 
-        prev_line_start = Some(line_start);
         line_start += TextSize::of(line);
 
         prev_line_annotations = this_line_annotations;
@@ -296,7 +315,7 @@ fn extract_line_annotations(mut line: &str) -> Vec<LineAnnotation> {
 }
 
 #[test]
-fn test_extract_annotations() {
+fn test_extract_annotations_1() {
     let text = stdx::trim_indent(
         r#"
 fn main() {
@@ -321,6 +340,25 @@ fn main() {
     assert_eq!(res[3].0.len(), 115);
 }
 
+#[test]
+fn test_extract_annotations_2() {
+    let text = stdx::trim_indent(
+        r#"
+fn main() {
+    (x,   y);
+   //^ a
+      //  ^ b
+  //^^^^^^^^ c
+}"#,
+    );
+    let res = extract_annotations(&text)
+        .into_iter()
+        .map(|(range, ann)| (&text[range], ann))
+        .collect::<Vec<_>>();
+
+    assert_eq!(res, [("x", "a".into()), ("y", "b".into()), ("(x,   y)", "c".into())]);
+}
+
 /// Returns `false` if slow tests should not run, otherwise returns `true` and
 /// also creates a file at `./target/.slow_tests_cookie` which serves as a flag
 /// that slow tests did run.