build runner prints "failed command" when testing

[genos]

First off, thank you very much for this library! As a zig newbie, having a property-based testing library is so helpful.

Describe the bug
Due to what I suspect is described in the ziglang repo here, when I run minish-enabled tests with zig build test in my code, I get something like

test
└─ run test w
OK. 100 tests passed.
failed command: ./.zig-cache/o/b95d4eb9425be31e19e7b96b315bfc36/test --cache-dir=./.zig-cache --seed=0xe35c8051 --listen=-

due to, I suspect, the use of std.debug.print in minish/runner.zig.

To Reproduce
Steps to reproduce the behavior:

1. Add minish to my build.zig per the README and fetch it with zig fetch.
2. Write a property test; in my little example, I've got the following to demonstrate the equivalence of two different versions of an algorithm:

test "equivalence" {
    const minish = @import("minish");
    const tuple_gen = minish.gen.tuple2(u64, u64, minish.gen.int(u64), minish.gen.int(u64));
    try minish.check(std.testing.allocator, tuple_gen, struct {
        fn f(t: struct { u64, u64 }) !void {
            var a, var n = t;
            const m: u64 = 1e9 + 7;
            a %= m;
            n %= m;
            try std.testing.expectEqual(recursive(a, n, m), iterative(a, n, m));
            try std.testing.expectEqual(inv(a, m, recursive), inv(a, m, iterative));
        }
    }.f, .{});
}

3. Run zig build test

Expected behavior
No warnings about "failed" things when the test passes.

Additional context
This is on zig 0.16.0.

Thanks again!