[Issue 24216] All symbols from object are publicly imported into every module

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24216

--- Comment #4 from Steven Schveighoffer <schveiguy at gmail.com> ---
FWIW, this was found in discord by someone asking what `std.stdio.string` is.
So it's not just std.math.

I just picked std.math as something I thought would likely not be dealing with
`string`.

But I also tried local modules without anything in it, and `mod1.string`
worked.

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