3781 – ICE(interpret.c): using no-argument C-style variadic function in CTFE

void _mixin() {
 writefln( "" );
}
void main() {
 mixin( _mixin );
} 
//Assertion failure: '!dim || (parameters && (parameters->dim == dim))' on line 140 in file 'interpret.c'
With both D1.056 and D2.040

Reduced test case for test suite:
-----
void badvariadic(...) {}
static assert(!is(typeof(mixin(badvariadic()))));
---
PATCH: interpret.c line 118. The check for C-style variadics failed in the case where there were no non-variadic parameters.
 TypeFunction *tf = (TypeFunction *)tb;
 Type *tret = tf->next->toBasetype();
- if (tf->varargs && arguments && parameters && arguments->dim != parameters->dim)
+ if (tf->varargs && arguments && (parameters && arguments->dim != parameters->dim) || (!parameters && arguments->dim))
 {	cantInterpret = 1;
	error("C-style variadic functions are not yet implemented in CTFE");
	return NULL;
 }

Oops, there's a missing parentheses. Should be:
if (tf->varargs && arguments && ((parameters && arguments->dim !=
parameters->dim) || (!parameters && arguments->dim)))

Changeset 376

Fixed dmd 1.057 and 2.041