From 28ca37175572403edeb92324d251fbceb4c2487f Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Tue, 25 May 2021 16:08:18 +0200
Subject: Consider trait to be in scope for trait-impl

---
 crates/hir_ty/src/infer.rs        |  2 ++
 crates/hir_ty/src/tests/traits.rs | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

(limited to 'crates/hir_ty')

diff --git a/crates/hir_ty/src/infer.rs b/crates/hir_ty/src/infer.rs
index edb65622f..164e85050 100644
--- a/crates/hir_ty/src/infer.rs
+++ b/crates/hir_ty/src/infer.rs
@@ -578,10 +578,12 @@ impl<'a> InferenceContext<'a> {
     }
 
     fn resolve_ops_try_ok(&self) -> Option<TypeAliasId> {
+        // FIXME resolve via lang_item once try v2 is stable
         let path = path![core::ops::Try];
         let trait_ = self.resolver.resolve_known_trait(self.db.upcast(), &path)?;
         let trait_data = self.db.trait_data(trait_);
         trait_data
+            // FIXME remove once try v2 is stable
             .associated_type_by_name(&name![Ok])
             .or_else(|| trait_data.associated_type_by_name(&name![Output]))
     }
diff --git a/crates/hir_ty/src/tests/traits.rs b/crates/hir_ty/src/tests/traits.rs
index 6cd8786ea..6ad96bfe3 100644
--- a/crates/hir_ty/src/tests/traits.rs
+++ b/crates/hir_ty/src/tests/traits.rs
@@ -3630,3 +3630,33 @@ fn test<F: FnOnce()>(f: F) {
         "#]],
     );
 }
+
+#[test]
+fn trait_in_scope_of_trait_impl() {
+    check_infer(
+        r#"
+mod foo {
+    pub trait Foo {
+        fn foo(self);
+        fn bar(self) -> usize { 0 }
+    }
+}
+impl foo::Foo for u32 {
+    fn foo(self) {
+        let _x = self.bar();
+    }
+}
+    "#,
+        expect![[r#"
+            45..49 'self': Self
+            67..71 'self': Self
+            82..87 '{ 0 }': usize
+            84..85 '0': usize
+            131..135 'self': u32
+            137..173 '{     ...     }': ()
+            151..153 '_x': usize
+            156..160 'self': u32
+            156..166 'self.bar()': usize
+        "#]],
+    );
+}
-- 
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