Fixes: Parsing of block declarations in an @implementation block.

src/shared/cplusplus/Parser.cpp

@@ -3763,10 +3763,26 @@ bool Parser::parseObjCMethodDefinitionList()
                 consumeToken();
             break;
 
-        default:
+        case T_SEMICOLON:
-            // ### warning message
             consumeToken();
             break;
+
+        default:
+            if (LA() == T_EXTERN && LA(2) == T_STRING_LITERAL) {
+                DeclarationAST *declaration = 0;
+                parseDeclaration(declaration);
+            } else {
+                unsigned start = cursor();
+                DeclarationAST *declaration = 0;
+                if (! parseBlockDeclaration(declaration)) {
+                    rewind(start);
+                    _translationUnit->error(cursor(),
+                                            "skip token `%s'", tok().spell());
+
+                    consumeToken();
+                }
+            }
+            break;
         } // switch
     }