hg: jdk/sandbox: 8207224: Javac compiles source code despite illegal use of unchecked conversions

[chris.hegarty at oracle.com]

Changeset: 6aeb6a23fb83
Author:    vromero
Date:      2018-12-18 16:22 -0500
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/6aeb6a23fb83

8207224: Javac compiles source code despite illegal use of unchecked conversions
Reviewed-by: mcimadamore, darcy

! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Source.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Types.java
+ test/langtools/tools/javac/T8207224/ReturnTypeSubstitutableTest.java
+ test/langtools/tools/javac/T8207224/ReturnTypeSubstitutableTest.out