[Issue 13544] calls to std.file.FileException are idup-ing their string arguments

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13544

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to hsteoh from comment #1)
> A better solution is to use to!string, which is a no-op if the source and
> destination types are identical.

It has the same problem - the copying is done at the call site, when it should
be done by the callee (in order to reduce code bloat).

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