Work around an apparent compiler bug to make my patch run

Without this, it would fail when optimization is turned on. The result of
the Load(bcx, llclosure) call would end up in llenv in a corrupted form.

Author: marijnh

src/comp/middle/trans.rs

@@ -3709,19 +3709,20 @@ fn trans_call(in_cx: @block_ctxt, f: @ast::expr,
     let bcx = f_res.bcx;
 
     let faddr = f_res.val;
-    let llenv = alt f_res.env {
-      null_env. { C_null(T_opaque_closure_ptr(*bcx_ccx(cx))) }
-      some_env(e) { e }
+    let llenv;
+    alt f_res.env {
+      null_env. { llenv = C_null(T_opaque_closure_ptr(*bcx_ccx(cx))); }
+      some_env(e) { llenv = e; }
       is_closure. {
         // It's a closure. Have to fetch the elements
         if f_res.is_mem { faddr = load_if_immediate(bcx, faddr, fn_expr_ty); }
         let pair = faddr;
         faddr = GEP(bcx, pair, [C_int(0), C_int(abi::fn_field_code)]);
         faddr = Load(bcx, faddr);
         let llclosure = GEP(bcx, pair, [C_int(0), C_int(abi::fn_field_box)]);
-        Load(bcx, llclosure)
+        llenv = Load(bcx, llclosure);
       }
-    };
+    }
 
     let ret_ty = ty::node_id_to_type(bcx_tcx(cx), id);
     let args_res =