Add parsing for type aliases

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 767393e04bc7843a24c5c572755c4a93ddab77da..16ce3f71d432fdcb96368769a35b3bbb12c0ef01 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -7837,3 +7837,33 @@ TEST(TypedModeBindingPatterns) {
   RunParserSyncTest(typed_context_data, error_data, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
 }
+
+TEST(TypedModeTypeAliases) {
+  const char* untyped_context_data[][2] = {{"", ""}, {NULL, NULL}};
+  const char* typed_context_data[][2] = {{"'use types'; ", ""}, {NULL, NULL}};
+
+  const char* correct_data[] = {
+    "type NumArray = number[]",
+    "type Fun = (x: number) => number",
+    "type Tree<A> = A | Tree<A>[]",
+    NULL
+  };
+
+  const char* error_data[] = {
+    "type Err<> = number",

[rossberg, 2016/04/18 09:27:43]

How about "type", with no identifier following.

[nickie, 2016/04/19 13:52:51]

Done.

We agreed that "type = number" should parse as an assignment of identifier
"number" to identifier "type", even in typed mode.  I'm making the necessary
changes and adding the test.

For a valid type alias declaration in typed mode, the contextual keyword "type"
must be followed by an identifier.  As in the case of "let", this will be so
even if there is a line terminator in between.

+    "type Err",
+    "type Err =",
+    "type Err = ()",
+    NULL
+  };
+
+  static const ParserFlag always_flags[] = {kAllowTypes};
+  RunParserSyncTest(untyped_context_data, correct_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+  RunParserSyncTest(typed_context_data, correct_data, kSuccess, NULL, 0,
+                    always_flags, arraysize(always_flags));
+  RunParserSyncTest(untyped_context_data, error_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+  RunParserSyncTest(typed_context_data, error_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+}