Fix hintXDeclaredButNotUsed for enum fields marked as used

compiler/lookups.nim

@@ -169,7 +169,8 @@ proc ensureNoMissingOrUnusedSymbols(c: PContext; scope: PScope) =
             getSymRepr(c.config, s))
       inc missingImpls
     elif {sfUsed, sfExported} * s.flags == {}:
-      if s.kind notin {skForVar, skParam, skMethod, skUnknown, skGenericParam}:
+      if s.kind notin {skForVar, skParam, skMethod, skUnknown, skGenericParam} and 
+        not (s.kind == skEnumField and {sfUsed, sfExported} * s.owner.flags != {}):
         # XXX: implicit type params are currently skTypes
         # maybe they can be made skGenericParam as well.
         if s.typ != nil and tfImplicitTypeParam notin s.typ.flags and

tests/pragmas/tused.nim

@@ -31,5 +31,10 @@ block:
   implementArithOpsNew(int)
   echoAdd 3, 5
 
+type
+  MyEnum {.used.} = enum
+    Val1, Val2, Val3
+
+
 static:
   echo "compile end"