Add flag to make await and yield keywords

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index f22a2c8fac4f1d8b5a0fbf9464119bbccd7ba739..2a121b7102572c38b981a1d206325b3ef35399e0 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -52,6 +52,8 @@ DEFINE_FLAG(bool, conditional_directives, false,
     "Enable conditional directives");
 DEFINE_FLAG(bool, warn_super, false,
     "Warning if super initializer not last in initializer list.");
+DEFINE_FLAG(bool, await_is_kw, false,

[zra, 2016/01/12 05:29:39]

I'll have to hardcode this flag into the Mojo source, and spelling out 'keyword'
will probably make it more readable there.

[hausner, 2016/01/12 17:49:51]

Done that for you, even though I had to break up the expressions over two lines
as a result :)

[zra, 2016/01/12 17:54:22]

Thanks =)

+    "await and yield are treated as proper keywords in synchronous code.");
 
 DECLARE_FLAG(bool, lazy_dispatchers);
 DECLARE_FLAG(bool, load_deferred_eagerly);
@@ -10180,12 +10182,12 @@ String* Parser::ExpectIdentifier(const char* msg) {
 
 
 bool Parser::IsAwaitKeyword() {
-  return await_is_keyword_ && IsSymbol(Symbols::Await());
+  return (FLAG_await_is_kw || await_is_keyword_) && IsSymbol(Symbols::Await());
 }
 
 
 bool Parser::IsYieldKeyword() {
-  return await_is_keyword_ && IsSymbol(Symbols::YieldKw());
+  return (FLAG_await_is_kw ||await_is_keyword_) && IsSymbol(Symbols::YieldKw());

[Ivan Posva, 2016/01/12 06:14:32]

Missing space.

[hausner, 2016/01/12 17:49:51]

Done.

 }