[Issue 14125] @trusted nested helper functions in std.file

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14125

--- Comment #70 from Andrei Alexandrescu <andrei at erdani.com> ---
Loosely related: https://github.com/D-Programming-Language/druntime/pull/1157.
That and more like it is definitely good to do.

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