DebugTrace

src/libcmd/command.cc

@@ -84,7 +84,7 @@ ref<EvalState> EvalCommand::getEvalState()
                 if (expr.staticenv)
                 {
                     auto vm = mapStaticEnvBindings(*expr.staticenv.get(), env);
-                    runRepl(evalState, ref<const Error>(&error), *vm);
+                    runRepl(evalState,  &error, *vm);
                 }
             };
     }

src/libcmd/command.hh

@@ -314,8 +314,6 @@ void printClosureDiff(
 
 void runRepl(
     ref<EvalState> evalState,
-    std::optional<ref<const Error>> debugError,
+    const Error *debugError,
     const std::map<std::string, Value *> & extraEnv);
-
-
 }

src/libcmd/repl.cc

@@ -50,7 +50,7 @@ struct NixRepl
     ref<EvalState> state;
     Bindings * autoArgs;
 
-    std::optional<ref<const Error>> debugError;
+    const Error *debugError;
 
     Strings loadedFiles;
 
@@ -470,13 +470,12 @@ bool NixRepl::processLine(string line)
 
         }
         else if (arg == "error") {
-          if (this->debugError.has_value()) {
-            // TODO user --show-trace setting?
-            showErrorInfo(std::cout, (*debugError)->info(), true);
+          if (this->debugError) {
+              showErrorInfo(std::cout, debugError->info(), true);
           }
           else
           {
-            notice("error information not available");
+              notice("error information not available");
           }
         }
     }
@@ -893,7 +892,7 @@ std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int m
 
 void runRepl(
     ref<EvalState> evalState,
-    std::optional<ref<const Error>> debugError,
+    const Error *debugError,
     const std::map<std::string, Value *> & extraEnv)
 {
     auto repl = std::make_unique<NixRepl>(evalState);