# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@oracle.com>
# Date 1443542651 -7200
# Node ID 3d9e283e2487a7e79759f6fca69ee0d2a0caf240
# Parent  df6a1647cfb3a789ed2d167c265b9a45d3da57bd
The PolyglotEngine passed to executionStart cannot be null or bad things happen then.

diff -r df6a1647cfb3 -r 3d9e283e2487 truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/Accessor.java
--- a/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/Accessor.java	Tue Sep 29 15:01:34 2015 +0200
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/Accessor.java	Tue Sep 29 18:04:11 2015 +0200
@@ -188,6 +188,7 @@
     private static Assumption oneVM = Truffle.getRuntime().createAssumption();
 
     protected Closeable executionStart(Object vm, Debugger[] fillIn, Source s) {
+        vm.getClass();
         final Closeable debugClose = DEBUG.executionStart(vm, fillIn, s);
         final Object prev = CURRENT_VM.get();
         if (!(vm == previousVM.get())) {