Properly process try/finally blocks.

samples/shell.cc

Index: samples/shell.cc
diff --git a/samples/shell.cc b/samples/shell.cc
index 6b67df6c6c56467611d4277426df9af250e07574..64f78f02c61ec6df0e0c1a8f2504478e2b0816be 100644
--- a/samples/shell.cc
+++ b/samples/shell.cc
@@ -27,6 +27,7 @@
 
 #include <v8.h>
 #include <v8-testing.h>
+#include <assert.h>
 #include <fcntl.h>
 #include <string.h>
 #include <stdio.h>
@@ -290,11 +291,13 @@ bool ExecuteString(v8::Handle<v8::String> source,
   } else {
     v8::Handle<v8::Value> result = script->Run();
     if (result.IsEmpty()) {
+      assert(try_catch.HasCaught());
       // Print errors that happened during execution.
       if (report_exceptions)
         ReportException(&try_catch);
       return false;
     } else {
+      assert(!try_catch.HasCaught());
       if (print_result && !result->IsUndefined()) {
         // If all went well and the result wasn't undefined then print
         // the returned value.