test_runner: don't assume the GeneralPurposeAllocator config

This allows changing the config in only 1 location (std.testing)

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index f4c8c6de9d..4267151638 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -23,7 +23,7 @@ pub fn main() anyerror!void {
 
     var leaks: usize = 0;
     for (test_fn_list) |test_fn, i| {
-        std.testing.allocator_instance = std.heap.GeneralPurposeAllocator(.{}){};
+        std.testing.allocator_instance = .{};
         defer {
             if (std.testing.allocator_instance.deinit()) {
                 leaks += 1;