Partial fix for issue 1934

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

Index: pkg/analyzer/lib/src/generated/parser.dart
diff --git a/pkg/analyzer/lib/src/generated/parser.dart b/pkg/analyzer/lib/src/generated/parser.dart
index 07ef20ea86ca9002c5c292c2b36e0b7aafb2f370..a823e7d2d470ab7c0822f3a1b561d42a2546e2b8 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -6372,7 +6372,7 @@ class Parser {
       Expression initialization = null;
       if (!_matches(TokenType.SEMICOLON)) {
         CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-        if (_matchesIdentifier() && _tokenMatchesKeyword(_peek(), Keyword.IN)) {
+        if (_matchesIdentifier() && (_tokenMatchesKeyword(_peek(), Keyword.IN) || _tokenMatches(_peek(), TokenType.COLON))) {
           List<VariableDeclaration> variables = new List<VariableDeclaration>();
           SimpleIdentifier variableName = parseSimpleIdentifier();
           variables.add(
@@ -6389,7 +6389,10 @@ class Parser {
         } else {
           initialization = parseExpression2();
         }
-        if (_matchesKeyword(Keyword.IN)) {
+        if (_matchesKeyword(Keyword.IN) || _matches(TokenType.COLON)) {
+          if (_matches(TokenType.COLON)) {
+            _reportErrorForCurrentToken(ParserErrorCode.COLON_IN_PLACE_OF_IN);
+          }
           DeclaredIdentifier loopVariable = null;
           SimpleIdentifier identifier = null;
           if (variableList == null) {
@@ -6426,7 +6429,7 @@ class Parser {
               identifier = variable.name;
             }
           }
-          Token inKeyword = _expectKeyword(Keyword.IN);
+          Token inKeyword = andAdvance;
           Expression iterator = parseExpression2();
           Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
           Statement body = parseStatement2();
@@ -10085,6 +10088,10 @@ class ParserErrorCode extends ErrorCode {
       'BREAK_OUTSIDE_OF_LOOP',
       "A break statement cannot be used outside of a loop or switch statement");
 
+  static const ParserErrorCode COLON_IN_PLACE_OF_IN = const ParserErrorCode(
+      'COLON_IN_PLACE_OF_IN',
+      "For-in loops use 'in' rather than a colon");
+
   static const ParserErrorCode CONST_AND_FINAL = const ParserErrorCode(
       'CONST_AND_FINAL',
       "Members cannot be declared to be both 'const' and 'final'");