Recover trait import suggestion

Author: estebank

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -1047,7 +1047,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
             }
         }
-        if !alt_rcvr_sugg && self.suggest_valid_traits(err, valid_out_of_scope_traits) {
+        if self.suggest_valid_traits(err, valid_out_of_scope_traits) {
             return;
         }
 

src/test/ui/suggestions/import-trait-for-method-call.stderr

@@ -12,6 +12,7 @@ LL |     fn finish(&self) -> u64;
    |        the method is available for `Box<DefaultHasher>` here
    |        the method is available for `Box<&mut DefaultHasher>` here
    |
+   = help: items from traits can only be used if the trait is in scope
 help: consider wrapping the receiver expression with the appropriate type
    |
 LL |     Box::new(h).finish()
@@ -20,6 +21,10 @@ help: consider wrapping the receiver expression with the appropriate type
    |
 LL |     Box::new(&mut h).finish()
    |     ^^^^^^^^^^^^^  ^
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
+   |
+LL | use std::hash::Hasher;
+   |
 
 error: aborting due to previous error