- Test runner will also check for leaks.

- `write` of qoi would leak memory.
- Issue when having an empty `Path` or just "."
- `set_env` would leak memory.

lib/std/compression/qoi.c3

@@ -74,7 +74,7 @@ import std::io;
 fn usz! write(String filename, char[] input, QOIDesc* desc) => @pool()
 {
 	// encode data
-	char[] output = new_encode(input, desc)!;
+	char[] output = new_encode(input, desc, allocator: allocator::temp())!;
 
 	// open file
 	File! f = file::open(filename, "wb");

lib/std/core/runtime_test.c3

@@ -256,13 +256,12 @@ fn bool run_tests(String[] args, TestUnit[] tests) @private
 		name.appendf("Testing %s ", unit.name);
 		name.append_repeat('.', max_name - unit.name.len + 2);
 		io::printf("%s ", name.str_view());
-
+		TrackingAllocator mem;
+		mem.init(allocator::heap());
 		if (libc::setjmp(&context.buf) == 0)
 		{
 			mute_output();
-			TrackingAllocator mem;
-			mem.init(allocator::heap());
-			bool has_leaks;
+			mem.clear();
 			mem::@scoped(&mem)
 			{
 				$if(!$$OLD_TEST):
@@ -274,22 +273,25 @@ fn bool run_tests(String[] args, TestUnit[] tests) @private
 						continue;
 					}
 				$endif
-				has_leaks = mem.has_leaks();
 			};
-			mem.free();
 			unmute_output(false); // all good, discard output
-
-			io::printf(test_context.has_ansi_codes ? "[\e[0;32mPASS\e[0m]" : "[PASS]");
-			tests_passed++;
-
-			if (has_leaks) io::print(" LEAKS!");
-			io::printn();
-
+			if (mem.has_leaks())
+            {
+            	io::print(test_context.has_ansi_codes ? "[\e[0;31mFAIL\e[0m]" : "[FAIL]");
+            	io::printn(" LEAKS DETECTED!");
+            	mem.print_report();
+            }
+            else
+            {
+                io::printfn(test_context.has_ansi_codes ? "[\e[0;32mPASS\e[0m]" : "[PASS]");
+				tests_passed++;
+			}
 			if (test_context.teardown_fn)
 			{
 				test_context.teardown_fn();
 			}
 		}
+		mem.free();
 	}
 	io::printfn("\n%d test%s run.\n", test_count-tests_skipped, test_count > 1 ? "s" : "");
 

lib/std/io/path.c3

@@ -395,7 +395,7 @@ fn Path! Path.parent(self)
 
 fn String! normalize(String path_str, PathEnv path_env = DEFAULT_PATH_ENV)
 {
-	if (!path_str.len) return "";
+	if (!path_str.len) return path_str;
 	usz path_start = volume_name_len(path_str, path_env)!;
 	if (path_start > 0 && path_env == PathEnv.WIN32)
 	{
@@ -506,7 +506,11 @@ fn String! normalize(String path_str, PathEnv path_env = DEFAULT_PATH_ENV)
 	if (len > path_start + 1 && is_separator(path_str[len - 1], path_env)) len--;
 	if (path_str.len > len) path_str.ptr[len] = 0;
 	// Empty path after normalization -> "."
-	if (!len) return ".";
+	if (!len)
+	{
+		path_str[0] = '.';
+		return path_str[:1];
+	}
 	return path_str[:len];
 }
 

lib/std/os/env.c3

@@ -57,7 +57,7 @@ fn bool set_var(String name, String value, bool overwrite = true) => @pool()
 		// https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setenvironmentvariable
 		return (win32::setEnvironmentVariableW(wname, value.to_temp_wstring()) ?? 1) == 0;
 	$case env::LIBC && !env::WIN32:
-		return libc::setenv(name.zstr_tcopy(), value.zstr_copy(), (int)overwrite) == 0;
+		return libc::setenv(name.zstr_tcopy(), value.zstr_tcopy(), (int)overwrite) == 0;
 	$default:
 		return false;
 	$endswitch