[dmd-internals] case hashOf(string literal) doesn't compile

[cy via dmd-internals]

void main() {
	pragma(msg,"bar".sizeof);
	size_t foo = 12;
	switch(foo) {
	case hashOf("bar"):
		break;
	}
}

I'm pretty sure this worked before. (htmld is full of these hash 
case statements.) But now, when I try to compile, it spits out 
errors like

druntime/import/object.d(3173): Error: pointer slice [0..16] 
exceeds allocated memory block [0..3]
druntime/import/object.d(3173):        called from here: hashOf(& 
arg[0..16], seed)
test.d(5):        called from here: hashOf("bar", 0LU)

I'm not sure, but I think "bar".sizeof is supposed to evaluate to 
3 at compile time, rather than 16 regardless of the string's 
length.