[Issue 17381] Checked format string is permissive after floating point argument

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17381

--- Comment #1 from Berni44 <bugzilla at bernis-buecher.de> ---
Meanwhile I found the reason for this: When checking at compile time, there is
a cannot-format-floats-at-compiletime-exception thrown. For testing purpose
this is ignored (as it is supposed to work in runtime) and hence the
orphan-arguments-exception overlooked.

Meanwhile format is able to format floats and doubles at compiletime (but yet
not reals). Therefore the code above works meanwhile, but not with 1.5L yet.

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