rust/src/librustc/mir
Simonas Kazlauskas 2f86c1605c Change destination accessor to return references
Previously it was returning a value, mostly for the two reasons:

* Cloning Lvalue is very cheap most of the time (i.e. when Lvalue is not a Projection);
* There’s users who want &mut lvalue and there’s users who want &lvalue. Returning a value allows
  to make either one easier when pattern matching (i.e. Some(ref dest) or Some(ref mut dest)).

However, I’m now convinced this is an invalid approach. Namely the users which want a mutable
reference may modify the Lvalue in-place, but the changes won’t be reflected in the final MIR,
since the Lvalue modified is merely a clone.

Instead, we have two accessors `destination` and `destination_mut` which return a reference to the
destination in desired mode.
2016-01-08 14:40:32 +02:00
..
repr.rs Change destination accessor to return references 2016-01-08 14:40:32 +02:00
tcx.rs
visit.rs Factor mir::[Mut]Visitor implementations into a common macro. 2016-01-07 05:49:46 -05:00