Make the GWT version of the compiler handle ES2017 (including async functions) by default.
@@ -133,7 +133,7 @@ public final class GwtRunner implements EntryPoint {
defaultFlags.exportLocalPropertyDefinitions = false;
defaultFlags.extraAnnotationNames = null;
defaultFlags.generateExports = false;
- defaultFlags.languageIn = "ECMASCRIPT6";
+ defaultFlags.languageIn = "ECMASCRIPT_2017";
defaultFlags.languageOut = "ECMASCRIPT5";
defaultFlags.newTypeInf = false;
defaultFlags.isolationMode = "NONE";
