From 631b2de30fbefad0324b5c247b79c0b0b4f402b1 Mon Sep 17 00:00:00 2001
From: pennae <github@quasiparticle.net>
Date: Sun, 4 Feb 2024 16:42:00 +0100
Subject: [PATCH] fix debugger crashing while printing envs

fixes #9932

(cherry picked from commit 5ccb06ee1b4c757ff4ca0aa6eac15d5656f7774c)
---
 .gitignore                   |  1 +
 src/libexpr/eval.cc          |  8 +++++---
 tests/functional/debugger.sh | 13 +++++++++++++
 tests/functional/local.mk    |  3 ++-
 4 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100644 tests/functional/debugger.sh

diff --git a/.gitignore b/.gitignore
index a47b195bb..a0a0786ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -94,6 +94,7 @@ perl/Makefile.config
 /tests/functional/ca/config.nix
 /tests/functional/dyn-drv/config.nix
 /tests/functional/repl-result-out
+/tests/functional/debugger-test-out
 /tests/functional/test-libstoreconsumer/test-libstoreconsumer
 
 # /tests/functional/lang/
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index dfb1cabda..f3ff2b4ff 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -744,7 +744,8 @@ void printEnvBindings(const SymbolTable & st, const StaticEnv & se, const Env &
     if (se.up && env.up) {
         std::cout << "static: ";
         printStaticEnvBindings(st, se);
-        printWithBindings(st, env);
+        if (se.isWith)
+            printWithBindings(st, env);
         std::cout << std::endl;
         printEnvBindings(st, *se.up, *env.up, ++lvl);
     } else {
@@ -756,7 +757,8 @@ void printEnvBindings(const SymbolTable & st, const StaticEnv & se, const Env &
                 std::cout << st[i.first] << " ";
         std::cout << ANSI_NORMAL;
         std::cout << std::endl;
-        printWithBindings(st, env);  // probably nothing there for the top level.
+        if (se.isWith)
+            printWithBindings(st, env);  // probably nothing there for the top level.
         std::cout << std::endl;
 
     }
@@ -778,7 +780,7 @@ void mapStaticEnvBindings(const SymbolTable & st, const StaticEnv & se, const En
     if (env.up && se.up) {
         mapStaticEnvBindings(st, *se.up, *env.up, vm);
 
-        if (!env.values[0]->isThunk()) {
+        if (se.isWith && !env.values[0]->isThunk()) {
             // add 'with' bindings.
             Bindings::iterator j = env.values[0]->attrs->begin();
             while (j != env.values[0]->attrs->end()) {
diff --git a/tests/functional/debugger.sh b/tests/functional/debugger.sh
new file mode 100644
index 000000000..63d88cbf3
--- /dev/null
+++ b/tests/functional/debugger.sh
@@ -0,0 +1,13 @@
+source common.sh
+
+clearStore
+
+# regression #9932
+echo ":env" | expect 1 nix eval --debugger --expr '(_: throw "oh snap") 42'
+echo ":env" | expect 1 nix eval --debugger --expr '
+  let x.a = 1; in
+  with x;
+  (_: builtins.seq x.a (throw "oh snap")) x.a
+' >debugger-test-out
+grep -P 'with: .*a' debugger-test-out
+grep -P 'static: .*x' debugger-test-out
diff --git a/tests/functional/local.mk b/tests/functional/local.mk
index 888c7e18a..f369c7c2c 100644
--- a/tests/functional/local.mk
+++ b/tests/functional/local.mk
@@ -127,7 +127,8 @@ nix_tests = \
   toString-path.sh \
   read-only-store.sh \
   nested-sandboxing.sh \
-  impure-env.sh
+  impure-env.sh \
+  debugger.sh
 
 ifeq ($(HAVE_LIBCPUID), 1)
   nix_tests += compute-levels.sh