tests: work around fallout from normalizing signatures separately.

src/test/compile-fail/associated-types-path-2.rs

@@ -38,11 +38,13 @@ pub fn f1_int_uint() {
 pub fn f1_uint_uint() {
     f1(2u32, 4u32);
     //~^ ERROR `u32: Foo` is not satisfied
+    //~| ERROR `u32: Foo` is not satisfied
 }
 
 pub fn f1_uint_int() {
     f1(2u32, 4i32);
     //~^ ERROR `u32: Foo` is not satisfied
+    //~| ERROR `u32: Foo` is not satisfied
 }
 
 pub fn f2_int() {

src/test/compile-fail/on-unimplemented/multiple-impls.rs

@@ -44,12 +44,18 @@ fn main() {
     //~^ ERROR E0277
     //~| NOTE trait message
     //~| NOTE required by
+    //~| ERROR E0277
+    //~| NOTE trait message
     Index::index(&[] as &[i32], Foo(2u32));
     //~^ ERROR E0277
     //~| NOTE on impl for Foo
     //~| NOTE required by
+    //~| ERROR E0277
+    //~| NOTE on impl for Foo
     Index::index(&[] as &[i32], Bar(2u32));
     //~^ ERROR E0277
     //~| NOTE on impl for Bar
     //~| NOTE required by
+    //~| ERROR E0277
+    //~| NOTE on impl for Bar
 }

src/test/compile-fail/on-unimplemented/on-impl.rs

@@ -33,4 +33,6 @@ fn main() {
     //~^ ERROR E0277
     //~| NOTE a usize is required
     //~| NOTE required by
+    //~| ERROR E0277
+    //~| NOTE a usize is required
 }