librustc: Change the syntax of subslice matching to use postfix `..`

instead of prefix `..`.

This breaks code that looked like:

    match foo {
        [ first, ..middle, last ] => { ... }
    }

Change this code to:

    match foo {
        [ first, middle.., last ] => { ... }
    }

RFC #55.

Closes #16967.

[breaking-change]

1 files changed, 3 insertions, 3 deletions

diff --git a/src/test/compile-fail/borrowck-vec-pattern-nesting.rs b/src/test/compile-fail/borrowck-vec-pattern-nesting.rs
index 4a56f982106..58932d1b422 100644
--- a/src/test/compile-fail/borrowck-vec-pattern-nesting.rs
+++ b/src/test/compile-fail/borrowck-vec-pattern-nesting.rs
@@ -22,7 +22,7 @@ fn b() {
     let mut vec = vec!(box 1i, box 2, box 3);
     let vec: &mut [Box<int>] = vec.as_mut_slice();
     match vec {
-        [.._b] => {
+        [_b..] => {
             vec[0] = box 4; //~ ERROR cannot assign
         }
     }
@@ -33,7 +33,7 @@ fn c() {
     let vec: &mut [Box<int>] = vec.as_mut_slice();
     match vec {
         [_a,         //~ ERROR cannot move out
-         .._b] => {  //~^ NOTE attempting to move value to here
+         _b..] => {  //~^ NOTE attempting to move value to here
 
             // Note: `_a` is *moved* here, but `b` is borrowing,
             // hence illegal.
@@ -50,7 +50,7 @@ fn d() {
     let mut vec = vec!(box 1i, box 2, box 3);
     let vec: &mut [Box<int>] = vec.as_mut_slice();
     match vec {
-        [.._a,     //~ ERROR cannot move out
+        [_a..,     //~ ERROR cannot move out
          _b] => {} //~ NOTE attempting to move value to here
         _ => {}
     }