Fix build failure on Linux and BSD by reverting r287597

Linux and BSD builds failing after this changes from rev 287597.

llvm-svn: 287631

1 files changed, 3 insertions, 3 deletions

diff --git a/lldb/source/Commands/CommandObjectFrame.cpp b/lldb/source/Commands/CommandObjectFrame.cpp
index 74de945dbd9..56e2cc94c9d 100644
--- a/lldb/source/Commands/CommandObjectFrame.cpp
+++ b/lldb/source/Commands/CommandObjectFrame.cpp
@@ -473,12 +473,12 @@ public:
                                bool &word_complete,
                                StringList &matches) override {
     // Arguments are the standard source file completer.
-    auto completion_str = input[cursor_index].ref;
-    completion_str = completion_str.take_front(cursor_char_position);
+    std::string completion_str(input.GetArgumentAtIndex(cursor_index));
+    completion_str.erase(cursor_char_position);
 
     CommandCompletions::InvokeCommonCompletionCallbacks(
         GetCommandInterpreter(), CommandCompletions::eVariablePathCompletion,
-        completion_str, match_start_point, max_return_elements, nullptr,
+        completion_str.c_str(), match_start_point, max_return_elements, nullptr,
         word_complete, matches);
     return matches.GetSize();
   }