test failure: const ptr to variable data changes at runtime

[andrewrk]

const assert = @import("std").debug.assert;

test "const ptr to variable data changes at runtime" {
    assert(foo_ref.name[0] == 'a');
    foo_ref.name = "b";
    assert(foo_ref.name[0] == 'b');
}

const Foo = struct {
    name: []const u8,
};

var foo_contents = Foo { .name = "a", };
const foo_ref = &foo_contents;