[Issue 22322] ImportC: struct with floating point members gives bizarre error.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22322

--- Comment #3 from mhh <maxhaton at gmail.com> ---
Ok, if this is with dmd master it's because recently it was made impossible to
use .tupleof inside C code (long story...), however this seems to have disabled
 use of .tupleof when the C struct is being consumed inside D code as well. 

-betterC gets rid of the error which suggests to me that it's something to do
with TypeInfo.

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