================
@@ -24,150 +25,16 @@ namespace lldb_dap {
 /// indexed children.
 Expected<VariablesResponseBody>
 VariablesRequestHandler::Run(const VariablesArguments &arguments) const {
-  const uint64_t var_ref = arguments.variablesReference;
-  const uint64_t count = arguments.count;
-  const uint64_t start = arguments.start;
-  const bool hex = arguments.format ? arguments.format->hex : false;
+  const var_ref_t var_ref = arguments.variablesReference;
+  if (var_ref == LLDB_DAP_INVALID_VAR_REF)
+    return llvm::createStringErrorV("Invalid variablesReference: {}", var_ref);
----------------
da-viper wrote:

We currently use the normal stringError when it an error that is not relevant 
to the user and have no idea about. see
https://github.com/llvm/llvm-project/blob/51217804f26a7ca66093365c4d50e56c7431c0ae/lldb/tools/lldb-dap/SourceBreakpoint.cpp#L91-L98

https://github.com/llvm/llvm-project/pull/179262
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