Fix a bug caught by adding LLVM_NODISCARD to StringRef.

llvm-svn: 287598

diff --git a/lldb/source/Target/StackFrame.cpp b/lldb/source/Target/StackFrame.cpp
index 8daa649..ec30fd6 100644 (file)
--- a/lldb/source/Target/StackFrame.cpp
+++ b/lldb/source/Target/StackFrame.cpp
@@ -931,7 +931,7 @@ ValueObjectSP StackFrame::GetValueForVariableExpressionPath(
         return ValueObjectSP();
       }
 
-      index_expr.drop_front();
+      index_expr = index_expr.drop_front();
       long final_index = 0;
       if (index_expr.getAsInteger(0, final_index)) {
         error.SetErrorStringWithFormat("invalid range expression \"'%s'\"",