diff --git a/src/libcmd/command.cc b/src/libcmd/command.cc
index 897d81981..b97458b2d 100644
--- a/src/libcmd/command.cc
+++ b/src/libcmd/command.cc
@@ -73,13 +73,13 @@ ref<EvalState> EvalCommand::getEvalState()
             debuggerHook = [evalState{ref<EvalState>(evalState)}](const Error & error, const Env & env, const Expr & expr) {
                 printError("%s\n\n" ANSI_BOLD "Starting REPL to allow you to inspect the current state of the evaluator.\n" ANSI_NORMAL, error.what());
 
-                printStaticEnvBindings(expr);
+                // printStaticEnvBindings(expr);
 
-                std::cout << evalState->vCallFlake << std::endl;
+                // std::cout << evalState->vCallFlake << std::endl;
 
-                std::cout << "expr: " << std::endl;
-                expr.show(std::cout);
-                std::cout << std::endl;
+                // std::cout << "expr: " << std::endl;
+                // expr.show(std::cout);
+                // std::cout << std::endl;
 
                 if (expr.staticenv)
                 {
diff --git a/src/libcmd/repl.cc b/src/libcmd/repl.cc
index 4a61d2be4..64547344a 100644
--- a/src/libcmd/repl.cc
+++ b/src/libcmd/repl.cc
@@ -202,9 +202,6 @@ namespace {
 
 void NixRepl::mainLoop(const std::vector<std::string> & files)
 {
-    std::cout << "iinitial mainLoop; " << std::endl;
-    // printStaticEnvBindings(*staticEnv, 0);
-
     string error = ANSI_RED "error:" ANSI_NORMAL " ";
     notice("Welcome to Nix " + nixVersion + ". Type :? for help.\n");
 
@@ -231,9 +228,6 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
 
     std::string input;
 
-    std::cout << "pre MAINLOOP; " << std::endl;
-    // printStaticEnvBindings(*staticEnv, 0);
-
     while (true) {
         // When continuing input from previous lines, don't print a prompt, just align to the same
         // number of chars as the prompt.
@@ -446,7 +440,6 @@ bool NixRepl::processLine(string line)
     }
 
     else if (command == ":d" || command == ":debug") {
-        std::cout << "debug: '" << arg << "'" <<  std::endl;
         if (arg == "stack") {
             std::cout << "eval stack:" << std::endl;
             for (auto iter = this->state->debugTraces.begin();
@@ -613,13 +606,11 @@ bool NixRepl::processLine(string line)
             line[p + 1] != '=' &&
             isVarName(name = removeWhitespace(string(line, 0, p))))
         {
-            std::cout << "isvarname" << std::endl;
             Expr * e = parseString(string(line, p + 1));
             Value *v = new Value(*state->allocValue());
             v->mkThunk(env, e);
             addVarToScope(state->symbols.create(name), *v);
         } else {
-            std::cout << "evalstring" << std::endl;
             Value v;
             evalString(line, v);
             printValue(std::cout, v, 1) << std::endl;
@@ -715,8 +706,6 @@ void NixRepl::addVarToScope(const Symbol & name, Value & v)
     staticEnv->sort();
     env->values[displ++] = &v;
     varNames.insert((string) name);
-    notice("Added variable to scope: %1%", name);
-
 }
 
 // version from master.
@@ -741,11 +730,8 @@ Expr * NixRepl::parseString(string s)
 
 void NixRepl::evalString(string s, Value & v)
 {
-            std::cout << "pre partstirns:l" << std::endl;
     Expr * e = parseString(s);
-            std::cout << "pre e->eval" << std::endl;
     e->eval(*state, *env, v);
-            std::cout << "prev fv" << std::endl;
     state->forceValue(v);
 }
 
@@ -924,10 +910,6 @@ void runRepl(
     }
 
     printError(hintfmt("The following extra variables are in scope: %s\n", concatStringsSep(", ", names)).str());
-    // printError("The following extra variables are in scope: %s\n", concatStringsSep(", ", names));
-
-    std::cout << "    pre repl->mainLoop({});" << std::endl;
-    // printStaticEnvBindings(*repl->staticEnv, 0);
     
     repl->mainLoop({});
 }
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 4bdcc052f..2596fbe3a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -858,17 +858,12 @@ LocalNoInlineNoReturn(void throwAssertionError(const Pos & pos, const char * s,
 
 LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char * s, const string & s1, Env & env, Expr *expr))
 {
-    std::cout << "throwUndefinedVarError" << std::endl;
-
-    std::cout << "loggerSettings.showTrace: " << loggerSettings.showTrace << std::endl;
-
     auto error = UndefinedVarError({
         .msg = hintfmt(s, s1),
         .errPos = pos
     });
 
     if (debuggerHook && expr) {
-        std::cout << "throwUndefinedVarError debuggerHook" << std::endl;
         debuggerHook(error, env, *expr);
     }
 
@@ -1525,7 +1520,6 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
 
                 lambda.body->eval(*this, env2, vCur);
             } catch (Error & e) {
-                std::cout << "eval showErrorInfo showTrace: " << loggerSettings.showTrace.get() << std::endl;
                 if (loggerSettings.showTrace.get()) {
                     addErrorTrace(e, lambda.pos, "while evaluating %s",
                         (lambda.name.set()
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 066dc4ecc..c537aa0c2 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -616,10 +616,6 @@ Expr * EvalState::parse(const char * text, FileOrigin origin,
 
     if (res) throw ParseError(data.error.value());
 
-    std::cout << "    data.result->bindVars(staticEnv); " << std::endl;
-
-    // printStaticEnvBindings(*staticEnv, 0);
-    
     data.result->bindVars(staticEnv);
 
     return data.result;
diff --git a/src/libutil/error.cc b/src/libutil/error.cc
index c2b9d2707..203d79087 100644
--- a/src/libutil/error.cc
+++ b/src/libutil/error.cc
@@ -221,8 +221,6 @@ static std::string indent(std::string_view indentFirst, std::string_view indentR
 
 std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool showTrace)
 {
-    std::cout << "showErrorInfo showTrace: " << showTrace << std::endl;
-  
     std::string prefix;
     switch (einfo.level) {
         case Verbosity::lvlError: {