detect if code is executing at compile time in zig (don't do this)

test.zig

const std = @import("std");

test "detect comptime" {
    std.debug.warn("\n");
    std.debug.warn("1={}\n", isCompTime());
    std.debug.warn("2={}\n", comptime isCompTime());
    std.debug.warn("3={}\n", comptime isCompTime());
    std.debug.warn("4={}\n", isCompTime());
}

fn isCompTime() bool {
    var t: bool = true;
    const x = if (t) u7(0) else u8(0);
    return @typeOf(x) == u7;
}