auto merge of #5307 : nikomatsakis/rust/remove-by-val, r=nikomatsakis

This is done in two steps:

First, we make foreign functions not consider modes at all.  This is because previously ++ mode was the only way to pass structs to foreign functions and so forth.  We also add a lint mode warning if you use `&&` mode in a foreign function, since the semantics of that change (it used to pass a pointer to the C function, now it doesn't).

Then, we remove by value and make it equivalent to `+` mode.  At the same time, we stop parsing `-` mode and convert all uses of it to `+` mode (it was already being parsed to `+` mode anyhow).

This obsoletes pull request #5298.

r? @brson

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/priority_queue.rs b/src/libstd/priority_queue.rs
index 31f29ce23f2..99d19c4839c 100644
--- a/src/libstd/priority_queue.rs
+++ b/src/libstd/priority_queue.rs
@@ -19,7 +19,7 @@ use core::vec;
 
 #[abi = "rust-intrinsic"]
 extern "C" mod rusti {
-    fn move_val_init<T>(dst: &mut T, -src: T);
+    fn move_val_init<T>(dst: &mut T, +src: T);
     fn init<T>() -> T;
 }