Auto merge of #862 - RalfJung:rustup, r=RalfJung

bump Rust

My hypothesis is that this will replicate https://travis-ci.com/rust-lang/miri/jobs/220221687 (so we know which commit range caused it).

rust-version

@@ -1 +1 @@
-0e9b465d729d07101b29b4d096d83edf9be82df0
+8b94e9e9188b65df38a5f1ae723617dc2dfb3155

tests/run-pass/issue-15080.rs

@@ -6,11 +6,11 @@ fn main() {
     let mut result = vec!();
     loop {
         x = match *x {
-            [1, n, 3, ref rest..] => {
+            [1, n, 3, ref rest @ ..] => {
                 result.push(n);
                 rest
             }
-            [n, ref rest..] => {
+            [n, ref rest @ ..] => {
                 result.push(n);
                 rest
             }

tests/run-pass/issue-17877.rs

@@ -9,8 +9,8 @@ fn main() {
     }, 42_usize);
 
     assert_eq!(match [0u8; 1024] {
-        [1, _..] => 0_usize,
-        [0, _..] => 1_usize,
+        [1, ..] => 0_usize,
+        [0, ..] => 1_usize,
         _ => 2_usize
     }, 1_usize);
 }

tests/run-pass/subslice_array.rs

@@ -6,7 +6,7 @@ fn bar(a: &'static str, b: &'static str) -> [&'static str; 4] {
 
 fn main() {
     let out = bar("baz", "foo");
-    let [a, xs.., d] = out;
+    let [a, xs @ .., d] = out;
     assert_eq!(a, "baz");
     assert_eq!(xs, ["foo", "foo"]);
     assert_eq!(d, "baz");

tests/run-pass/vec-matching-fold.rs

@@ -9,7 +9,7 @@ fn foldl<T, U, F>(values: &[T],
     U: Clone+Debug, T:Debug,
     F: FnMut(U, &T) -> U,
 {    match values {
-        &[ref head, ref tail..] =>
+        &[ref head, ref tail @ ..] =>
             foldl(tail, function(initial, head), function),
         &[] => {
             let res = initial.clone(); res
@@ -25,7 +25,7 @@ fn foldr<T, U, F>(values: &[T],
     F: FnMut(&T, U) -> U,
 {
     match values {
-        &[ref head.., ref tail] =>
+        &[ref head @ .., ref tail] =>
             foldr(head, function(tail, initial), function),
         &[] => {
             let res = initial.clone(); res