Add an UNUSED_SHOWN_NAMES hint to the analyzer

pkg/analyzer/lib/src/generated/error.dart

Index: pkg/analyzer/lib/src/generated/error.dart
diff --git a/pkg/analyzer/lib/src/generated/error.dart b/pkg/analyzer/lib/src/generated/error.dart
index 4a78c0d410d417db33f32faad601533bc673afe0..9b588dad387ff03d2fe97fb94a7c6d6d41e45b86 100644
--- a/pkg/analyzer/lib/src/generated/error.dart
+++ b/pkg/analyzer/lib/src/generated/error.dart
@@ -2706,6 +2706,7 @@ abstract class ErrorCode {
     HintCode.UNUSED_CATCH_CLAUSE,
     HintCode.UNUSED_CATCH_STACK,
     HintCode.UNUSED_LOCAL_VARIABLE,
+    HintCode.UNUSED_SHOWN_NAME,
     HintCode.USE_OF_VOID_RESULT,
     HintCode.FILE_IMPORT_INSIDE_LIB_REFERENCES_FILE_OUTSIDE,
     HintCode.FILE_IMPORT_OUTSIDE_LIB_REFERENCES_FILE_INSIDE,
@@ -3778,6 +3779,12 @@ class HintCode extends ErrorCode {
       "The value of the local variable '{0}' is not used");
 
   /**
+   * Unused shown names are names shown on imports which are never used.
+   */
+  static const HintCode UNUSED_SHOWN_NAME =
+      const HintCode('UNUSED_SHOWN_NAME', "Unused name shown in import");

[Brian Wilkerson, 2016/04/06 15:17:40]

The name should be included in the error message. Perhaps something like

"The name {0} is shown, but not used."

[srawlins, 2016/04/07 15:27:22]

Done.

+
+  /**
    * Hint for cases where the source expects a method or function to return a
    * non-void result, but the method or function signature returns void.
    *