6 files changed, 98 insertions, 109 deletions

diff --git a/crates/hir/src/diagnostics.rs b/crates/hir/src/diagnostics.rs
index 5e2f94698..a5e982b75 100644
--- a/crates/hir/src/diagnostics.rs
+++ b/crates/hir/src/diagnostics.rs
@@ -16,7 +16,7 @@ pub use crate::diagnostics_sink::{
 };
 
 macro_rules! diagnostics {
-    ($($diag:ident)*) => {
+    ($($diag:ident),*) => {
         pub enum AnyDiagnostic {$(
             $diag(Box<$diag>),
         )*}
@@ -31,7 +31,7 @@ macro_rules! diagnostics {
     };
 }
 
-diagnostics![UnresolvedModule];
+diagnostics![UnresolvedModule, MissingFields];
 
 #[derive(Debug)]
 pub struct UnresolvedModule {
@@ -321,17 +321,6 @@ impl Diagnostic for MissingUnsafe {
     }
 }
 
-// Diagnostic: missing-structure-fields
-//
-// This diagnostic is triggered if record lacks some fields that exist in the corresponding structure.
-//
-// Example:
-//
-// ```rust
-// struct A { a: u8, b: u8 }
-//
-// let a = A { a: 10 };
-// ```
 #[derive(Debug)]
 pub struct MissingFields {
     pub file: HirFileId,
@@ -340,34 +329,6 @@ pub struct MissingFields {
     pub missed_fields: Vec<Name>,
 }
 
-impl Diagnostic for MissingFields {
-    fn code(&self) -> DiagnosticCode {
-        DiagnosticCode("missing-structure-fields")
-    }
-    fn message(&self) -> String {
-        let mut buf = String::from("Missing structure fields:\n");
-        for field in &self.missed_fields {
-            format_to!(buf, "- {}\n", field);
-        }
-        buf
-    }
-
-    fn display_source(&self) -> InFile<SyntaxNodePtr> {
-        InFile {
-            file_id: self.file,
-            value: self
-                .field_list_parent_path
-                .clone()
-                .map(SyntaxNodePtr::from)
-                .unwrap_or_else(|| self.field_list_parent.clone().into()),
-        }
-    }
-
-    fn as_any(&self) -> &(dyn Any + Send + 'static) {
-        self
-    }
-}
-
 // Diagnostic: missing-pat-fields
 //
 // This diagnostic is triggered if pattern lacks some fields that exist in the corresponding structure.
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index ff6c68dbc..583d92f20 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -609,23 +609,21 @@ impl Module {
         }
         for decl in self.declarations(db) {
             match decl {
-                crate::ModuleDef::Function(f) => f.diagnostics(db, sink, internal_diagnostics),
-                crate::ModuleDef::Module(m) => {
+                ModuleDef::Function(f) => acc.extend(f.diagnostics(db, sink, internal_diagnostics)),
+                ModuleDef::Module(m) => {
                     // Only add diagnostics from inline modules
                     if def_map[m.id.local_id].origin.is_inline() {
                         acc.extend(m.diagnostics(db, sink, internal_diagnostics))
                     }
                 }
-                _ => {
-                    decl.diagnostics(db, sink);
-                }
+                _ => decl.diagnostics(db, sink),
             }
         }
 
         for impl_def in self.impl_defs(db) {
             for item in impl_def.items(db) {
                 if let AssocItem::Function(f) = item {
-                    f.diagnostics(db, sink, internal_diagnostics);
+                    acc.extend(f.diagnostics(db, sink, internal_diagnostics));
                 }
             }
         }
@@ -1033,7 +1031,8 @@ impl Function {
         db: &dyn HirDatabase,
         sink: &mut DiagnosticSink,
         internal_diagnostics: bool,
-    ) {
+    ) -> Vec<AnyDiagnostic> {
+        let mut acc: Vec<AnyDiagnostic> = Vec::new();
         let krate = self.module(db).id.krate();
 
         let source_map = db.body_with_source_map(self.id.into()).1;
@@ -1114,14 +1113,17 @@ impl Function {
                                     .into_iter()
                                     .map(|idx| variant_data.fields()[idx].name.clone())
                                     .collect();
-                                sink.push(MissingFields {
-                                    file: source_ptr.file_id,
-                                    field_list_parent: AstPtr::new(record_expr),
-                                    field_list_parent_path: record_expr
-                                        .path()
-                                        .map(|path| AstPtr::new(&path)),
-                                    missed_fields,
-                                })
+                                acc.push(
+                                    MissingFields {
+                                        file: source_ptr.file_id,
+                                        field_list_parent: AstPtr::new(record_expr),
+                                        field_list_parent_path: record_expr
+                                            .path()
+                                            .map(|path| AstPtr::new(&path)),
+                                        missed_fields,
+                                    }
+                                    .into(),
+                                )
                             }
                         }
                     }
@@ -1234,6 +1236,7 @@ impl Function {
         for diag in hir_ty::diagnostics::validate_module_item(db, krate, self.id.into()) {
             sink.push(diag)
         }
+        acc
     }
 
     /// Whether this function declaration has a definition.
diff --git a/crates/ide/src/diagnostics.rs b/crates/ide/src/diagnostics.rs
index 075aae8d5..ef8c8044c 100644
--- a/crates/ide/src/diagnostics.rs
+++ b/crates/ide/src/diagnostics.rs
@@ -5,6 +5,7 @@
 //! original files. So we need to map the ranges.
 
 mod unresolved_module;
+mod missing_fields;
 
 mod fixes;
 mod field_shorthand;
@@ -123,9 +124,6 @@ pub(crate) fn diagnostics(
     }
     let res = RefCell::new(res);
     let sink_builder = DiagnosticSinkBuilder::new()
-        .on::<hir::diagnostics::MissingFields, _>(|d| {
-            res.borrow_mut().push(diagnostic_with_fix(d, &sema, resolve));
-        })
         .on::<hir::diagnostics::MissingOkOrSomeInTailExpr, _>(|d| {
             res.borrow_mut().push(diagnostic_with_fix(d, &sema, resolve));
         })
@@ -232,7 +230,8 @@ pub(crate) fn diagnostics(
     let ctx = DiagnosticsContext { config, sema, resolve };
     for diag in diags {
         let d = match diag {
-            AnyDiagnostic::UnresolvedModule(d) => unresolved_module::render(&ctx, &d),
+            AnyDiagnostic::UnresolvedModule(d) => unresolved_module::unresolved_module(&ctx, &d),
+            AnyDiagnostic::MissingFields(d) => missing_fields::missing_fields(&ctx, &d),
         };
         if let Some(code) = d.code {
             if ctx.config.disabled.contains(code.as_str()) {
diff --git a/crates/ide/src/diagnostics/fixes.rs b/crates/ide/src/diagnostics/fixes.rs
index 8640d7231..a2e792b3b 100644
--- a/crates/ide/src/diagnostics/fixes.rs
+++ b/crates/ide/src/diagnostics/fixes.rs
@@ -2,7 +2,6 @@
 //! The same module also has all curret custom fixes for the diagnostics implemented.
 mod change_case;
 mod create_field;
-mod fill_missing_fields;
 mod remove_semicolon;
 mod replace_with_find_map;
 mod wrap_tail_expr;
diff --git a/crates/ide/src/diagnostics/fixes/fill_missing_fields.rs b/crates/ide/src/diagnostics/missing_fields.rs
index c76f6008a..aee780972 100644
--- a/crates/ide/src/diagnostics/fixes/fill_missing_fields.rs
+++ b/crates/ide/src/diagnostics/missing_fields.rs
@@ -1,53 +1,77 @@
-use hir::{db::AstDatabase, diagnostics::MissingFields, Semantics};
-use ide_assists::AssistResolveStrategy;
-use ide_db::{source_change::SourceChange, RootDatabase};
-use syntax::{algo, ast::make, AstNode};
+use hir::{db::AstDatabase, InFile};
+use ide_assists::Assist;
+use ide_db::source_change::SourceChange;
+use stdx::format_to;
+use syntax::{algo, ast::make, AstNode, SyntaxNodePtr};
 use text_edit::TextEdit;
 
-use crate::{
-    diagnostics::{fix, fixes::DiagnosticWithFixes},
-    Assist,
-};
-
-impl DiagnosticWithFixes for MissingFields {
-    fn fixes(
-        &self,
-        sema: &Semantics<RootDatabase>,
-        _resolve: &AssistResolveStrategy,
-    ) -> Option<Vec<Assist>> {
-        // Note that although we could add a diagnostics to
-        // fill the missing tuple field, e.g :
-        // `struct A(usize);`
-        // `let a = A { 0: () }`
-        // but it is uncommon usage and it should not be encouraged.
-        if self.missed_fields.iter().any(|it| it.as_tuple_index().is_some()) {
-            return None;
-        }
-
-        let root = sema.db.parse_or_expand(self.file)?;
-        let field_list_parent = self.field_list_parent.to_node(&root);
-        let old_field_list = field_list_parent.record_expr_field_list()?;
-        let new_field_list = old_field_list.clone_for_update();
-        for f in self.missed_fields.iter() {
-            let field =
-                make::record_expr_field(make::name_ref(&f.to_string()), Some(make::expr_unit()))
-                    .clone_for_update();
-            new_field_list.add_field(field);
-        }
-
-        let edit = {
-            let mut builder = TextEdit::builder();
-            algo::diff(old_field_list.syntax(), new_field_list.syntax())
-                .into_text_edit(&mut builder);
-            builder.finish()
-        };
-        Some(vec![fix(
-            "fill_missing_fields",
-            "Fill struct fields",
-            SourceChange::from_text_edit(self.file.original_file(sema.db), edit),
-            sema.original_range(field_list_parent.syntax()).range,
-        )])
+use crate::diagnostics::{fix, Diagnostic, DiagnosticsContext};
+
+// Diagnostic: missing-structure-fields
+//
+// This diagnostic is triggered if record lacks some fields that exist in the corresponding structure.
+//
+// Example:
+//
+// ```rust
+// struct A { a: u8, b: u8 }
+//
+// let a = A { a: 10 };
+// ```
+pub(super) fn missing_fields(ctx: &DiagnosticsContext<'_>, d: &hir::MissingFields) -> Diagnostic {
+    let mut message = String::from("Missing structure fields:\n");
+    for field in &d.missed_fields {
+        format_to!(message, "- {}\n", field);
     }
+
+    let ptr = InFile::new(
+        d.file,
+        d.field_list_parent_path
+            .clone()
+            .map(SyntaxNodePtr::from)
+            .unwrap_or_else(|| d.field_list_parent.clone().into()),
+    );
+
+    Diagnostic::new(
+        "missing-structure-fields",
+        message,
+        ctx.sema.diagnostics_display_range(ptr).range,
+    )
+    .with_fixes(fixes(ctx, d))
+}
+
+fn fixes(ctx: &DiagnosticsContext<'_>, d: &hir::MissingFields) -> Option<Vec<Assist>> {
+    // Note that although we could add a diagnostics to
+    // fill the missing tuple field, e.g :
+    // `struct A(usize);`
+    // `let a = A { 0: () }`
+    // but it is uncommon usage and it should not be encouraged.
+    if d.missed_fields.iter().any(|it| it.as_tuple_index().is_some()) {
+        return None;
+    }
+
+    let root = ctx.sema.db.parse_or_expand(d.file)?;
+    let field_list_parent = d.field_list_parent.to_node(&root);
+    let old_field_list = field_list_parent.record_expr_field_list()?;
+    let new_field_list = old_field_list.clone_for_update();
+    for f in d.missed_fields.iter() {
+        let field =
+            make::record_expr_field(make::name_ref(&f.to_string()), Some(make::expr_unit()))
+                .clone_for_update();
+        new_field_list.add_field(field);
+    }
+
+    let edit = {
+        let mut builder = TextEdit::builder();
+        algo::diff(old_field_list.syntax(), new_field_list.syntax()).into_text_edit(&mut builder);
+        builder.finish()
+    };
+    Some(vec![fix(
+        "fill_missing_fields",
+        "Fill struct fields",
+        SourceChange::from_text_edit(d.file.original_file(ctx.sema.db), edit),
+        ctx.sema.original_range(field_list_parent.syntax()).range,
+    )])
 }
 
 #[cfg(test)]
diff --git a/crates/ide/src/diagnostics/unresolved_module.rs b/crates/ide/src/diagnostics/unresolved_module.rs
index abf53a57c..4c8c74ff7 100644
--- a/crates/ide/src/diagnostics/unresolved_module.rs
+++ b/crates/ide/src/diagnostics/unresolved_module.rs
@@ -8,7 +8,10 @@ use crate::diagnostics::{fix, Diagnostic, DiagnosticsContext};
 // Diagnostic: unresolved-module
 //
 // This diagnostic is triggered if rust-analyzer is unable to discover referred module.
-pub(super) fn render(ctx: &DiagnosticsContext<'_>, d: &hir::UnresolvedModule) -> Diagnostic {
+pub(super) fn unresolved_module(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedModule,
+) -> Diagnostic {
     Diagnostic::new(
         "unresolved-module",
         "unresolved module",