diff --git a/.gitignore b/.gitignore
index 5c2aabbe0..3d5623f87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -80,8 +80,10 @@ TAGS
 /.cache/
 /compile_commands.json
 
-# 'nix build' resulting symlink
+# Nix
 result
+/.envrc
+/.direnv/
 
 # macOS
 .DS_Store
@@ -89,4 +91,4 @@ result
 # tests
 /test/tmp/*
 /test/testrun
-/test/test_suite_runner
\ No newline at end of file
+/test/test_suite_runner
diff --git a/lib/std/core/runtime_test.c3 b/lib/std/core/runtime_test.c3
index 8848dced9..2d3dc59aa 100644
--- a/lib/std/core/runtime_test.c3
+++ b/lib/std/core/runtime_test.c3
@@ -140,7 +140,6 @@ fn void unmute_output(bool has_error) @local
 	usz log_size = test_context.fake_stdout.seek(0, Seek.CURSOR)!!;
 	if (has_error)
 	{
-		io::printf("\nTesting %s ", test_context.current_test_name);
 		io::printn(test_context.has_ansi_codes ? "[\e[0;31mFAIL\e[0m]" : "[FAIL]");
 	}
 
diff --git a/nix/default.nix b/nix/default.nix
index cee6d78d7..e8e2bfe53 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -26,7 +26,10 @@ in llvmPackages.stdenv.mkDerivation (_:
     removeSuffix "\"" ( removePrefix "\"" ( elemAt ( splitString " " foundLine ) 2 ) );
 
   src = ../.;
-  
+ 
+  # See https://github.com/symphorien/nixseparatedebuginfod for usage
+  separateDebugInfo = true;
+
   # Here we substitute GIT_HASH which is not set for cmake in nix builds.
   # Similar situation is with __DATE__ and __TIME__ macros, which are
   # set to "Jan 01 1980 00:00:00" by default.
diff --git a/src/compiler/llvm_codegen_expr.c b/src/compiler/llvm_codegen_expr.c
index f86380748..bc68462e3 100644
--- a/src/compiler/llvm_codegen_expr.c
+++ b/src/compiler/llvm_codegen_expr.c
@@ -2643,8 +2643,8 @@ static void llvm_emit_slice_values(GenContext *c, Expr *slice, BEValue *parent_r
 	BEValue parent_addr_x;
 	llvm_emit_expr(c, &parent_addr_x, parent_expr);
 	LLVMValueRef parent_load_value = NULL;
-	LLVMValueRef parent_base;
-	LLVMValueRef parent_addr;
+	LLVMValueRef parent_base = NULL;
+	LLVMValueRef parent_addr = NULL;
 	if (parent_type->type_kind == TYPE_POINTER)
 	{
 		llvm_value_rvalue(c, &parent_addr_x);