hg: lambda/lambda/langtools: Fix regression in lambda-compatibility check.

[maurizio.cimadamore at oracle.com]

Changeset: 0a2ef8bc9777
Author:    mcimadamore
Date:      2012-04-19 16:35 +0100
URL:       http://hg.openjdk.java.net/lambda/lambda/langtools/rev/0a2ef8bc9777

Fix regression in lambda-compatibility check.
*) Overhaul tree visitor for checking return values of lambda expression
*) Fix bug in structural most specific combo test

! src/share/classes/com/sun/tools/javac/comp/Attr.java
! test/tools/javac/lambda/mostSpecific/StructuralMostSpecificTest.java