5 files changed, 130 insertions, 61 deletions

diff --git a/crates/ide/src/hover.rs b/crates/ide/src/hover.rs
index 01dd0c0da..e81bcf73e 100644
--- a/crates/ide/src/hover.rs
+++ b/crates/ide/src/hover.rs
@@ -3016,8 +3016,8 @@ fn foo() {
                                     file_id: FileId(
                                         1,
                                     ),
-                                    full_range: 247..429,
-                                    focus_range: 286..292,
+                                    full_range: 248..430,
+                                    focus_range: 287..293,
                                     name: "Future",
                                     kind: Trait,
                                     description: "pub trait Future",
diff --git a/crates/ide_assists/src/handlers/apply_demorgan.rs b/crates/ide_assists/src/handlers/apply_demorgan.rs
index c93959e66..e2bd6e456 100644
--- a/crates/ide_assists/src/handlers/apply_demorgan.rs
+++ b/crates/ide_assists/src/handlers/apply_demorgan.rs
@@ -147,74 +147,92 @@ fn opposite_logic_op(kind: ast::BinOp) -> Option<&'static str> {
 
 #[cfg(test)]
 mod tests {
-    use ide_db::helpers::FamousDefs;
-
-    use super::*;
-
     use crate::tests::{check_assist, check_assist_not_applicable};
 
-    const ORDABLE_FIXTURE: &'static str = r"
-//- /lib.rs deps:core crate:ordable
-struct NonOrderable;
-struct Orderable;
-impl core::cmp::Ord for Orderable {}
-";
-
-    fn check(ra_fixture_before: &str, ra_fixture_after: &str) {
-        let before = &format!(
-            "//- /main.rs crate:main deps:core,ordable\n{}\n{}{}",
-            ra_fixture_before,
-            FamousDefs::FIXTURE,
-            ORDABLE_FIXTURE
-        );
-        check_assist(apply_demorgan, before, &format!("{}\n", ra_fixture_after));
-    }
+    use super::*;
 
     #[test]
     fn demorgan_handles_leq() {
-        check(
-            r"use ordable::Orderable;
+        check_assist(
+            apply_demorgan,
+            r#"
+//- minicore: ord, derive
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+struct S;
+
 fn f() {
-    Orderable < Orderable &&$0 Orderable <= Orderable
-}",
-            r"use ordable::Orderable;
+    S < S &&$0 S <= S
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+struct S;
+
 fn f() {
-    !(Orderable >= Orderable || Orderable > Orderable)
-}",
+    !(S >= S || S > S)
+}
+"#,
         );
-        check(
-            r"use ordable::NonOrderable;
+
+        check_assist(
+            apply_demorgan,
+            r#"
+//- minicore: ord, derive
+struct S;
+
 fn f() {
-    NonOrderable < NonOrderable &&$0 NonOrderable <= NonOrderable
-}",
-            r"use ordable::NonOrderable;
+    S < S &&$0 S <= S
+}
+"#,
+            r#"
+struct S;
+
 fn f() {
-    !(!(NonOrderable < NonOrderable) || !(NonOrderable <= NonOrderable))
-}",
+    !(!(S < S) || !(S <= S))
+}
+"#,
         );
     }
 
     #[test]
     fn demorgan_handles_geq() {
-        check(
-            r"use ordable::Orderable;
+        check_assist(
+            apply_demorgan,
+            r#"
+//- minicore: ord, derive
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+struct S;
+
 fn f() {
-    Orderable > Orderable &&$0 Orderable >= Orderable
-}",
-            r"use ordable::Orderable;
+    S > S &&$0 S >= S
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+struct S;
+
 fn f() {
-    !(Orderable <= Orderable || Orderable < Orderable)
-}",
+    !(S <= S || S < S)
+}
+"#,
         );
-        check(
-            r"use ordable::NonOrderable;
+        check_assist(
+            apply_demorgan,
+            r#"
+//- minicore: ord, derive
+struct S;
+
 fn f() {
-    Orderable > Orderable &&$0 Orderable >= Orderable
-}",
-            r"use ordable::NonOrderable;
+    S > S &&$0 S >= S
+}
+"#,
+            r#"
+struct S;
+
 fn f() {
-    !(!(Orderable > Orderable) || !(Orderable >= Orderable))
-}",
+    !(!(S > S) || !(S >= S))
+}
+"#,
         );
     }
 
diff --git a/crates/ide_assists/src/tests.rs b/crates/ide_assists/src/tests.rs
index 29bd4a563..4e96ff1ec 100644
--- a/crates/ide_assists/src/tests.rs
+++ b/crates/ide_assists/src/tests.rs
@@ -35,6 +35,7 @@ pub(crate) fn with_single_file(text: &str) -> (RootDatabase, FileId) {
     RootDatabase::with_single_file(text)
 }
 
+#[track_caller]
 pub(crate) fn check_assist(assist: Handler, ra_fixture_before: &str, ra_fixture_after: &str) {
     let ra_fixture_after = trim_indent(ra_fixture_after);
     check(assist, ra_fixture_before, ExpectedResult::After(&ra_fixture_after), None);
diff --git a/crates/ide_db/src/helpers/famous_defs_fixture.rs b/crates/ide_db/src/helpers/famous_defs_fixture.rs
index fa4fc5307..6310fc0e1 100644
--- a/crates/ide_db/src/helpers/famous_defs_fixture.rs
+++ b/crates/ide_db/src/helpers/famous_defs_fixture.rs
@@ -1,15 +1,5 @@
 //- /libcore.rs crate:core
 //! Signatures of traits, types and functions from the core lib for use in tests.
-pub mod cmp {
-
-    pub trait Ord {
-        fn cmp(&self, other: &Self) -> Ordering;
-        fn max(self, other: Self) -> Self;
-        fn min(self, other: Self) -> Self;
-        fn clamp(self, min: Self, max: Self) -> Self;
-    }
-}
-
 pub mod prelude {
     pub mod rust_2018 {
         pub use crate::{
diff --git a/crates/test_utils/src/minicore.rs b/crates/test_utils/src/minicore.rs
index a5a7c2f7d..9ec541c57 100644
--- a/crates/test_utils/src/minicore.rs
+++ b/crates/test_utils/src/minicore.rs
@@ -24,6 +24,9 @@
 //!     iterators: iterator
 //!     default: sized
 //!     from: sized
+//!     eq: sized
+//!     ord: eq, option
+//!     derive:
 
 pub mod marker {
     // region:sized
@@ -173,6 +176,49 @@ pub mod ops {
     // endregion:fn
 }
 
+// region:eq
+pub mod cmp {
+    #[lang = "eq"]
+    pub trait PartialEq<Rhs: ?Sized = Self> {
+        fn eq(&self, other: &Rhs) -> bool;
+    }
+
+    pub trait Eq: PartialEq<Self> {}
+
+    // region:derive
+    #[rustc_builtin_macro]
+    pub macro PartialEq($item:item) {}
+    #[rustc_builtin_macro]
+    pub macro Eq($item:item) {}
+    // endregion:derive
+
+    // region:ord
+    #[lang = "partial_ord"]
+    pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+        fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+    }
+
+    pub trait Ord: Eq + PartialOrd<Self> {
+        fn cmp(&self, other: &Self) -> Ordering;
+    }
+
+    pub enum Ordering {
+        Less = -1,
+        Equal = 0,
+        Greater = 1,
+    }
+
+    // region:derive
+    #[rustc_builtin_macro]
+    pub macro PartialOrd($item:item) {}
+    #[rustc_builtin_macro]
+    pub macro Ord($item:item) {}
+    // endregion:derive
+
+    // endregion:ord
+}
+// endregion:eq
+
 // region:slice
 pub mod slice {
     #[lang = "slice"]
@@ -342,16 +388,30 @@ pub mod iter {
 }
 // endregion:iterator
 
+// region:derive
+mod macros {
+    pub(crate) mod builtin {
+        #[rustc_builtin_macro]
+        pub macro derive($item:item) {
+            /* compiler built-in */
+        }
+    }
+}
+// endregion:derive
+
 pub mod prelude {
     pub mod v1 {
         pub use crate::{
+            cmp::{Eq, PartialEq},               // :eq
+            cmp::{Ord, PartialOrd},             // :ord
+            convert::{From, Into},              // :from
             default::Default,                   // :default
             iter::{IntoIterator, Iterator},     // :iterator
+            macros::builtin::derive,            // :derive
             marker::Sized,                      // :sized
             ops::{Fn, FnMut, FnOnce},           // :fn
             option::Option::{self, None, Some}, // :option
             result::Result::{self, Err, Ok},    // :result
-            convert::{From, Into},    // :from
         };
     }