1946 – Compiler crashes on attempt to implicit cast const typedef to non-const.

If an attempt is made to implicitly cast a const instance of a typedef of a class to a non-const instance, DMD 2.012 crashes.
The following code causes the compiler to crash:
 class Foo {}
 typedef Foo Test;
 void f(Test test) {}
 void main()
 {
 const Test test;
 f(test);
 }
If "typedef" is replaced with "alias" this does not occur. If "f(Test test)" is declared as "f(in Test test)" this does not occur. If Test is typedef'd to a value-type this does not occur (including structs).

Fixed DMD2.030