Support for AwaitExpression in unlinked expressions.

pkg/analyzer/lib/src/summary/idl.dart

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index 53102b1200e031d3a975987b0871fc3c202859d8..b762086e2c525e940e99f846e57c9680d71d5ba1 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -2341,6 +2341,12 @@ enum UnlinkedExprOperation {
    * first.
    */
   ifNull,
+
+  /**
+   * Pop the top value from the stack.  If the value is `Future<T>`, push `T`
+   * into the stack.  Otherwise, push `dynamic`.

[Paul Berry, 2016/11/29 19:15:57]

This comment should reflect the behavior of values, not types.  So it should say
something like:

"Pop the top value from the stack.  Treat it as a Future and await its
completion.  Then push the awaited value onto the stack."

[scheglov, 2016/11/29 19:39:13]

Done.

+   */
+  await,
 }
 
 /**