Index: lldb/source/Expression/REPL.cpp
===================================================================
--- lldb/source/Expression/REPL.cpp
+++ lldb/source/Expression/REPL.cpp
@@ -457,6 +457,12 @@
     debugger.GetCommandInterpreter().HandleCompletion(sub_request);
     StringList matches, descriptions;
     sub_result.GetMatches(matches);
+    // Prepend command prefix that was excluded in the completion request
+    if (request.GetCursorIndex() == 0) {
+      for (auto &match : matches) {
+        match.insert(0, 1, ':');
+      }
+    }
     sub_result.GetDescriptions(descriptions);
     request.AddCompletions(matches, descriptions);
     return;