https://issues.dlang.org/show_bug.cgi?id=24455

          Issue ID: 24455
           Summary: [ImportC] va_arg fails in working C code
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: lance@lancebachmeier.com

I'm compiling a working and well-tested C library. This fails:

gretl_matrix_block *gretl_matrix_block_new (gretl_matrix **pm, ...) {
va_list ap;
va_start(ap, pm);
va_arg(ap, int);

Results in

Error: template `va_arg` is not callable using argument types
`!(int)(__va_list_tag*)`
#defines(521):        Candidate is: `va_arg(__MP314, __MP315)(__MP314 v,
__MP315 l)`

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