Remove typechecker work-arounds now that I know how

Author: marijnh

src/comp/lib/llvm.rs

@@ -1549,7 +1549,7 @@ fn float_width(TypeRef llt) -> uint {
       2 { 64u }
       3 { 80u }
       4 | 5 { 128u }
-      _ { fail "llvm_float_width called on a non-float type"; 0u }
+      _ { fail "llvm_float_width called on a non-float type" }
     };
 }
 

src/comp/middle/trans.rs

@@ -4465,8 +4465,7 @@ fn trans_cast(&@block_ctxt cx, &@ast::expr e, ast::node_id id) -> result {
         e_res.bcx.build.PointerCast(e_res.val, ll_t_out)
       }
       _ {
-        ccx.sess.bug("Translating unsupported cast.");
-        C_nil() // FIXME the typechecker doesn't seem to understand _|_ here
+        ccx.sess.bug("Translating unsupported cast.")
       }
     };
     ret rslt(e_res.bcx, newval);