Modifying UnitTestFramework to give more useful messages and in an easier to understand way.

Adding more coverage for strict mode and extra label test cases.
Condensing preexisting label tests into the new test file which all follow the unit test framework now.

Author: Kenji Fukuda

lib/Parser/Parse.cpp

@@ -8508,6 +8508,10 @@ ParseNodePtr Parser::ParseExpr(int oplMin,
                 }
             }
         }
+        else if (nop == knopAwait && m_token.tk == tkColon)
+        {
+            Error(ERRAwaitAsLabelInAsync);
+        }
         else
         {
             // Disallow spread after a unary operator.
@@ -9684,6 +9688,10 @@ ParseNodePtr Parser::ParseStatement()
     switch (tok)
     {
     case tkEOF:
+        if (labelledStatement)
+        {
+            Error(ERRLabelFollowedByEOF);
+        }
         if (buildAST)
         {
             pnode = nullptr;
@@ -9710,7 +9718,11 @@ ParseNodePtr Parser::ParseStatement()
         ParseNodeFnc* pNodeFnc = (ParseNodeFnc*)pnode;
         if (labelledStatement)
         {
-            if (pNodeFnc->IsAsync())
+            if (IsStrictMode())
+            {
+                Error(ERRFunctionAfterLabelInStrict);
+            }
+            else if (pNodeFnc->IsAsync())
             {
                 Error(ERRLabelBeforeAsyncFncDeclaration);
             }

lib/Parser/perrors.h

@@ -105,4 +105,7 @@ LSC_ERROR_MSG(1089, ERRInvalidLHSInFor, "Invalid left-hand side in for loop")
 LSC_ERROR_MSG(1090, ERRLabelBeforeLexicalDeclaration, "Labels not allowed before lexical declaration")
 LSC_ERROR_MSG(1091, ERRLabelBeforeGeneratorDeclaration, "Labels not allowed before generator declaration")
 LSC_ERROR_MSG(1092, ERRLabelBeforeAsyncFncDeclaration, "Labels not allowed before async function declaration")
-LSC_ERROR_MSG(1093, ERRLabelBeforeClassDeclaration, "Labels not allowed before class declaration")
+LSC_ERROR_MSG(1093, ERRLabelBeforeClassDeclaration, "Labels not allowed before class declaration")
+LSC_ERROR_MSG(1094, ERRLabelFollowedByEOF, "Unexpected end of script after a label.")
+LSC_ERROR_MSG(1095, ERRFunctionAfterLabelInStrict, "Function declarations not allowed after a label in strict mode.")
+LSC_ERROR_MSG(1096, ERRAwaitAsLabelInAsync, "Use of 'await' as label in async function is not allowed.")