Gracefully handle syntax errors in Parser::PatternRewriter.

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index bc12153729c622cf8ad031f2ae486a679949368a..5eb675020d6c70e40a73dab2d99817bdc33ea344 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -7982,3 +7982,25 @@ TEST(MiscSyntaxErrors) {
 
   RunParserSyncTest(context_data, error_data, kError, NULL, 0, NULL, 0);
 }
+
+TEST(PatternSyntaxError) {
+  v8::V8::Initialize();
+  v8::HandleScope scope(CcTest::isolate());
+  v8::Context::Scope context_scope(v8::Context::New(CcTest::isolate()));
+
+  const char* sources[] = {
+      // crbug.com/582626
+      "{ NaN ,chA((evarA=new t ( l = !.0[((... co -a0([1]))=> greturnkf",
+
+      // Simplified case:
+      "(...rest - a) => b",
+  };
+
+  for (int i = 0; i < arraysize(sources); i++) {
+    v8::TryCatch try_catch(CcTest::isolate());
+    v8_compile(v8_str(sources[i]));
+    CHECK(try_catch.HasCaught());
+    v8::String::Utf8Value exception(try_catch.Exception());
+    CHECK_EQ(0, strcmp("SyntaxError: Not supported", *exception));
+  }
+}