Added an extra check in trans_alt

Gratuitous right now, but I'm going to change the type of trans::type_of

src/comp/middle/trans_alt.rs

@@ -576,6 +576,7 @@ fn bind_irrefutable_pat(bcx: @block_ctxt, pat: @ast::pat, val: ValueRef,
             // FIXME: Could constrain pat_bind to make this
             // check unnecessary.
             check (type_has_static_size(ccx, ty));
+            check non_ty_var(ccx, ty);
             let llty = trans::type_of(ccx, pat.span, ty);
             let alloc = trans::alloca(bcx, llty);
             bcx =