Move 'coherence-overlapping-inherent-impl-trait' test to ui

src/test/ui/codemap_tests/coherence-overlapping-inherent-impl-trait.rs

@@ -11,6 +11,6 @@
 #![allow(dead_code)]
 
 trait C {}
-impl C { fn f() {} } //~ ERROR duplicate definitions with name `f`
+impl C { fn f() {} }
 impl C { fn f() {} }
 fn main() { }

src/test/ui/codemap_tests/coherence-overlapping-inherent-impl-trait.stderr

@@ -0,0 +1,10 @@
+error[E0592]: duplicate definitions with name `f`
+  --> $DIR/coherence-overlapping-inherent-impl-trait.rs:14:10
+   |
+14 | impl C { fn f() {} }
+   |          ^^^^^^^^^ duplicate definitions for `f`
+15 | impl C { fn f() {} }
+   |          --------- other definition for `f`
+
+error: aborting due to previous error
+