1const std = @import("std");
 2const expect = std.testing.expect;
 3
 4test "allowzero" {
 5    var zero: usize = 0; // var to make to runtime-known
 6    _ = &zero; // suppress 'var is never mutated' error
 7    const ptr: *allowzero i32 = @ptrFromInt(zero);
 8    try expect(@intFromPtr(ptr) == 0);
 9}
10
11// test