toolchain: Update to Rust 1.31.0

We updated the production toolchain from 1.30 to 1.31 in CL:1366446.
This CL does the same upgrade for the local developer toolchain and
Kokoro.

The relevant changes are in rust-toolchain and kokoro/Dockerfile.
The rest are from rustfmt.

TEST=cargo fmt --all -- --check
TEST=as described in kokoro/README.md

Change-Id: I3b4913f3e237baa36c664b4953be360c09efffd4
Reviewed-on: https://chromium-review.googlesource.com/1374376
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: David Tolnay <dtolnay@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/gpu_buffer/src/lib.rs b/gpu_buffer/src/lib.rs
index ad8dd63..49f346d 100644
--- a/gpu_buffer/src/lib.rs
+++ b/gpu_buffer/src/lib.rs
@@ -782,7 +782,8 @@ mod tests {
                 512,
                 Format::new(b'X', b'R', b'2', b'4'),
                 Flags::empty().use_scanout(true),
-            ).expect("failed to create buffer");
+            )
+            .expect("failed to create buffer");
 
         assert_eq!(bo.width(), 1024);
         assert_eq!(bo.height(), 512);
@@ -801,7 +802,8 @@ mod tests {
                 1024,
                 Format::new(b'X', b'R', b'2', b'4'),
                 Flags::empty().use_scanout(true),
-            ).expect("failed to create buffer");
+            )
+            .expect("failed to create buffer");
         bo.export_plane_fd(0).expect("failed to export plane");
     }
 
@@ -816,7 +818,8 @@ mod tests {
                 1024,
                 Format::new(b'X', b'R', b'2', b'4'),
                 Flags::empty().use_scanout(true).use_linear(true),
-            ).expect("failed to create buffer");
+            )
+            .expect("failed to create buffer");
         let mut dst: Vec<u8> = Vec::new();
         dst.resize((bo.stride() * bo.height()) as usize, 0x4A);
         let dst_len = dst.len() as u64;
@@ -830,7 +833,8 @@ mod tests {
             [dst.as_mut_slice().get_slice(0, dst_len).unwrap()]
                 .iter()
                 .cloned(),
-        ).expect("failed to read bo");
+        )
+        .expect("failed to read bo");
         bo.read_to_volatile(
             0,
             0,
@@ -838,7 +842,8 @@ mod tests {
             1024,
             0,
             dst.as_mut_slice().get_slice(0, dst_len).unwrap(),
-        ).expect("failed to read bo");
+        )
+        .expect("failed to read bo");
         assert!(dst.iter().all(|&x| x == 0x4A));
     }
 }