Commits on Feb 5, 2015

1. make for PAT in ITER_EXPR { ... } a terminating-scope for ITER_EXPR. …

   In effect, temporary anonymous values created during the evaluation of
   ITER_EXPR no longer not live for the entirety of the block surrounding
   the for-loop; instead they only live for the extent of the for-loop
   itself, and no longer.
   
   ----
   
   There is one case I know of that this breaks, demonstrated to me by
   niko (but it is also a corner-case that is useless in practice).  Here
   is that case:
   
   ```
   fn main() {
       let mut foo: Vec<&i8> = Vec::new();
       for i in &[1, 2, 3] { foo.push(i) }
   }
   ```
   
   Note that if you add any code following the for-loop above, or even a
   semicolon to the end of it, then the code will stop compiling (i.e.,
   it gathers a vector of references but the gathered vector cannot
   actually be used.)
   
   (The above code, despite being useless, did occur in one run-pass test
   by accident; that test is updated here to accommodate the new
   striction.)
   
   ----
   
   So, technically this is a:
   
   [breaking-change]

   

   pnkfelix committed Feb 5, 2015
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