Remove references to @Trait from a compiler error message

src/test/compile-fail/issue-5883.rs

@@ -11,13 +11,15 @@
 trait A {}
 
 struct Struct {
-    r: A //~ ERROR reference to trait `A` where a type is expected
+    r: A //~ ERROR reference to trait `A` where a type is expected; try `~A` or `&A`
 }
 
-fn new_struct(r: A) -> Struct { //~ ERROR reference to trait `A` where a type is expected
+fn new_struct(r: A) -> Struct {
+    //~^ ERROR reference to trait `A` where a type is expected; try `~A` or `&A`
     Struct { r: r }
 }
 
 trait Curve {}
-enum E {X(Curve)} //~ ERROR reference to trait `Curve` where a type is expected
+enum E {X(Curve)}
+//~^ ERROR reference to trait `Curve` where a type is expected; try `~Curve` or `&Curve`
 fn main() {}

src/test/compile-fail/regions-trait-2.rs

@@ -29,7 +29,7 @@ fn make_gc() -> @get_ctxt  {
     let ctxt = ctxt { v: 22u };
     let hc = has_ctxt { c: &ctxt };
     return @hc as @get_ctxt;
-    //^~ ERROR source contains reference
+    //~^ ERROR source contains reference
 }
 
 fn main() {

src/test/compile-fail/trait-bounds-not-on-bare-trait.rs

@@ -13,7 +13,8 @@ trait Foo {
 
 // This should emit the less confusing error, not the more confusing one.
 
-fn foo(_x: Foo:Send) { //~ERROR reference to trait `Foo` where a type is expected
+fn foo(_x: Foo:Send) {
+    //~^ERROR reference to trait `Foo` where a type is expected; try `~Foo` or `&Foo`
 }
 
 fn main() { }