From 2ff00003f1857052bbc593f3368acdf4dfdccfe6 Mon Sep 17 00:00:00 2001
From: Sean Callanan <scallanan@apple.com>
Date: Mon, 28 Mar 2016 21:10:36 +0000
Subject: [PATCH] Don't try to actually run code when the expression is
 top-level.

llvm-svn: 264660
---
 lldb/source/Expression/UserExpression.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lldb/source/Expression/UserExpression.cpp b/lldb/source/Expression/UserExpression.cpp
index 2d1336b3ef51..19829936d1c2 100644
--- a/lldb/source/Expression/UserExpression.cpp
+++ b/lldb/source/Expression/UserExpression.cpp
@@ -281,6 +281,11 @@ UserExpression::Evaluate (ExecutionContext &exe_ctx,
             if (!diagnostic_manager.Diagnostics().size())
                 error.SetExpressionError(lldb::eExpressionSetupError, "expression needed to run but couldn't");
         }
+        else if (execution_policy == eExecutionPolicyTopLevel)
+        {
+            error.SetError(UserExpression::kNoResult, lldb::eErrorTypeGeneric);
+            return lldb::eExpressionCompleted;
+        }
         else
         {
             if (options.InvokeCancelCallback (lldb::eExpressionEvaluationExecution))