FMT_COMPILE is inconsistent compared to without

[teksturi]

I found out that these will throw and are not even catched compile time.

fmt::print("{a0}{}", fmt::arg("a0", "bug?"));
fmt::print("{a0}{}", fmt::arg("a0", "foo"), "bug?"));

Strange thing is that if we use FMT_COMPILE these work just fine

fmt::print(FMT_COMPILE("{a0}{}"), fmt::arg("a0", "foo"));
fmt::print(FMT_COMPILE("{a0}{}"), fmt::arg("a0", "foo"), "faa"));

I however would say that if there is named argument and after that there is automatic argument it would always be compile time error. Same way as index based.

I also found that this can be run

fmt::print(FMT_COMPILE("{n}"), fmt::arg("n", "bug?"), fmt::arg("n", 3));

but without FMT_COMPILE it will throw at runtime "duplicate named arg".

I would also like to know what is intended functionality so maybe some one can try to fix this issue. Also is intention that FMT_COMPILE will always work same way as without?

[teksturi]

The second case is probably same as in here #4124

[vitaut]

The second case is probably same as in here #4124

Yes and the first case is expected. Compile-time checks for named arguments require UDLs (_a).