Fix diagnostics for unresolved patterns

Author: jseyfried

src/librustc_resolve/lib.rs

@@ -2408,7 +2408,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                                 }
                             }
                         }
-                    } else {
+                    } else if let Err(false) = self.resolve_path(pat_id, &path, 0, ValueNS) {
                         resolve_error(
                             self,
                             path.span,

src/test/compile-fail/pattern-error-continue.rs

@@ -42,4 +42,8 @@ fn main() {
     //~^ ERROR mismatched types
     //~| expected `char`
     //~| found `bool`
+
+    match () {
+        E::V => {} //~ ERROR failed to resolve. Use of undeclared type or module `E`
+    }
 }