Add inline compile-fail markers to tests

Author: estebank

src/test/ui/suggestions/pub-ident-fn-2.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 pub foo(s: usize) { bar() }
+//~^ ERROR missing `fn` for method definition
 
 fn main() {
     foo(2);

src/test/ui/suggestions/pub-ident-fn-or-struct-2.rs

@@ -9,5 +9,6 @@
 // except according to those terms.
 
 pub S();
+//~^ ERROR missing `fn` or `struct` for method or struct definition
 
 fn main() {}

src/test/ui/suggestions/pub-ident-fn-or-struct.rs

@@ -9,5 +9,6 @@
 // except according to those terms.
 
 pub S (foo) bar
+//~^ ERROR missing `fn` or `struct` for method or struct definition
 
 fn main() {}

src/test/ui/suggestions/pub-ident-fn.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 pub   foo(s: usize) -> bool { true }
+//~^ ERROR missing `fn` for method definition
 
 fn main() {
     foo(2);

src/test/ui/suggestions/pub-ident-struct.rs

@@ -9,5 +9,6 @@
 // except according to those terms.
 
 pub S {
+//~^ ERROR missing `struct` for struct definition
 }
 fn main() {}