Bug 966 – is(H==function) fails if H is a function type

The following code fails with an assertion: bool isfun(H)( H h){ static if (is( H == function )) return true; else return false; } void fun( int i ) {} void main() { assert( isfun( &fun ) ); // should not } BTW: If H is a delegate type, then is(H==delegate) works fine in the corresponding code.

Added to DStress as http://dstress.kuehne.cn/compile/i/is_17_A.d http://dstress.kuehne.cn/compile/i/is_17_B.d

That's because &fun is not a function type, it's a pointer to a function. Rewrite the template as: bool isfun(H)( H h){ static if (is( H F == F*) && is(F == function )) return true; else return false; } and it will work.