[Issue 13568] Support compile-time format strings in std.format

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13568

--- Comment #1 from hsteoh at quickfur.ath.cx ---
Another major advantage of compile-time format strings is that we can avoid
format() pulling in half of Phobos on the off-chance that some obscure runtime
format string might actually need that code to format something. By analysing
the format string at compile-time, we can make it so that only the necessary
bits of code are imported, thus greatly clearing up the big hairball that is
Phobos module interdependencies currently.

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