rust-lang#3410: add missing false positive case in uitests

Author: Tim Nielens

tests/ui/use_self.fixed

@@ -176,11 +176,26 @@ mod issue3410 {
     struct B;
 
     trait Trait<T> {
-        fn a(v: T);
+        fn a(v: T) -> Self;
     }
 
     impl Trait<Vec<A>> for Vec<B> {
-        fn a(_: Vec<A>) {}
+        fn a(_: Vec<A>) -> Self {
+            unimplemented!()
+        }
+    }
+
+    // FIXME
+    impl<T> Trait<Vec<A>> for Vec<T>
+        where
+            T: Trait<B>,
+    {
+        fn a(v: Vec<A>) -> Self {
+            <Self<B>>::a(v)
+                .into_iter()
+                .map(Trait::a)
+                .collect()
+        }
     }
 }
 

tests/ui/use_self.rs

@@ -176,11 +176,26 @@ mod issue3410 {
     struct B;
 
     trait Trait<T> {
-        fn a(v: T);
+        fn a(v: T) -> Self;
     }
 
     impl Trait<Vec<A>> for Vec<B> {
-        fn a(_: Vec<A>) {}
+        fn a(_: Vec<A>) -> Self {
+            unimplemented!()
+        }
+    }
+
+    // FIXME
+    impl<T> Trait<Vec<A>> for Vec<T>
+        where
+            T: Trait<B>,
+    {
+        fn a(v: Vec<A>) -> Self {
+            <Vec<B>>::a(v)
+                .into_iter()
+                .map(Trait::a)
+                .collect()
+        }
     }
 }
 

tests/ui/use_self.stderr

@@ -113,52 +113,58 @@ LL |             let _ = Enum::A;
    |                     ^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:199:13
+  --> $DIR/use_self.rs:194:14
+   |
+LL |             <Vec<B>>::a(v)
+   |              ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
+  --> $DIR/use_self.rs:214:13
    |
 LL |             nested::A::fun_1();
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:200:13
+  --> $DIR/use_self.rs:215:13
    |
 LL |             nested::A::A;
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:202:13
+  --> $DIR/use_self.rs:217:13
    |
 LL |             nested::A {};
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:221:13
+  --> $DIR/use_self.rs:236:13
    |
 LL |             TestStruct::from_something()
    |             ^^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:235:25
+  --> $DIR/use_self.rs:250:25
    |
 LL |         async fn g() -> S {
    |                         ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:236:13
+  --> $DIR/use_self.rs:251:13
    |
 LL |             S {}
    |             ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:240:16
+  --> $DIR/use_self.rs:255:16
    |
 LL |             &p[S::A..S::B]
    |                ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:240:22
+  --> $DIR/use_self.rs:255:22
    |
 LL |             &p[S::A..S::B]
    |                      ^ help: use the applicable keyword: `Self`
 
-error: aborting due to 25 previous errors
+error: aborting due to 26 previous errors