remove dead assignments

src/test/compile-fail/borrowck-pure-scope-in-call.rs

@@ -18,6 +18,8 @@ fn test2() {
 
     pure_borrow(x, x = ~5);  //! ERROR assigning to mutable local variable prohibited due to outstanding loan
     //!^ NOTE loan of mutable local variable granted here
+
+    copy x;
 }
 
 fn main() {

src/test/compile-fail/no-reuse-move-arc.rs

@@ -1,4 +1,3 @@
-// error-pattern: unsatisfied precondition constraint
 use std;
 import std::arc;
 import comm::*;
@@ -6,13 +5,13 @@ import comm::*;
 fn main() {
     let v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
     let arc_v = arc::arc(v);
-    
-    task::spawn() {|move arc_v|
+
+    task::spawn() {|move arc_v| //! NOTE move of variable occurred here
         let v = *arc::get(&arc_v);
         assert v[3] == 4;
     };
 
-    assert (*arc::get(&arc_v))[2] == 3;
+    assert (*arc::get(&arc_v))[2] == 3; //! ERROR use of moved variable: `arc_v`
 
     log(info, arc_v);
 }