1916 – segfault on invalid string concat

this invalid piece of code crashes the dmd compiler.
[CODE]
void main() {
	string crash = 01 ~ " foo?";
}
[/CODE]

This looks similar to a BUG 1702 which did get fixed, a later release appears to have re-introduced it.

Only segfaults on D2.
fog.d(2): Error: incompatible types for ((1) ~ (" foo?")): 'int' and 'immutable(
char)[]'
fog.d(2): Error: Can only concatenate arrays, not (int ~ immutable(char)[])
fog.d(2): Error: cannot implicitly convert expression ("\x01 foo?") of type int
to immutable(char)[]
[SEGFAULT]

This is indeed the same as bug 1702. A patch to fix this one also fixed 1702.
*** This bug has been marked as a duplicate of 1702 ***

Oops, 1702 seems to be already fixed. This isn't the same.
Here's a simple patch which prevents the segfault.
Index: optimize.c
===================================================================
--- optimize.c	(revision 23)
+++ optimize.c	(working copy)
@@ -456,6 +457,8 @@
 Expression *e1old = e1;
 e1 = e1->optimize(result);
 e1 = fromConstInitializer(result, e1);
+	
+	if (!type->toBasetype()->ty) return this; // Bugzilla 1916
 
 if (e1 == e1old &&
 	e1->op == TOKarrayliteral &&

Fixed DMD2.030 and 1.045.