[Issue 14680] Investigate the use of .di files for Phobos

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14680

Seb <greensunny12 at gmail.com> changed:

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--- Comment #4 from Seb <greensunny12 at gmail.com> ---
Tried it here: https://github.com/dlang/phobos/pull/6123

tl;dr: it's not worth it and brings a lot of troubles with it. We simple should
make the imports faster.
I'm incled to close this as WONTFIX as the investigation is over.

OTOH just stripping out the unittest would result in a small improvement -
though probably not measurable in comparison to other, more worthwhile tricks
at the compiler-level.

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