Execution of build.py was failed with error of issue #53491 of rust

[7k8m]

This seems to have something to do with.
rust-lang/rust#53491

[7k8m]

[tomohito.nakayama@shorthair deno (master=)]$ ./tools/build.py 
ninja: Entering directory `/Users/tomohito.nakayama/dev/deno/target/debug'
[23/266] ACTION //build_extra/rust:arrayvec_rustc(//build/toolchain/mac:clang_x64)
FAILED: rust_crates/libarrayvec.rlib 
python ../../build_extra/rust/run.py /Users/tomohito.nakayama/dev/deno/prebuilt/mac/sccache rustc ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/lib.rs --crate-name=arrayvec --crate-type=rlib --emit=link,dep-info --edition=2015 --out-dir=rust_crates -Cextra-filename= -Cmetadata=\"_rustc\ 1.35.0\ \(3c235d560\ 2019-05-20\)\" -L dependency=rust_crates --color=always -g -Dwarnings --cap-lints allow --cfg has_stable_maybe_uninit --extern nodrop=rust_crates/libnodrop.rlib
error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
 --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:4:5
  |
4 | use std::mem::MaybeUninit as StdMaybeUninit;
  |     ^^^^^^^^^^^^^^^^^^^^^

error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
 --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:7:12
  |
7 |     inner: StdMaybeUninit<T>,
  |            ^^^^^^^^^^^^^^^^^

error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
  --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:13:30
   |
13 |         MaybeUninit { inner: StdMaybeUninit::uninit() }
   |                              ^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
  --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:18:30
   |
18 |         MaybeUninit { inner: StdMaybeUninit::new(v) }
   |                              ^^^^^^^^^^^^^^^^^^^

error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
  --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:31:20
   |
31 |         self.inner.as_ptr() as *const T::Item
   |                    ^^^^^^

error[E0658]: use of unstable library feature 'maybe_uninit' (see issue #53491)
  --> ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/arrayvec-0.4.11/src/maybe_uninit_stable.rs:38:20
   |
38 |         self.inner.as_mut_ptr() as *mut T::Item
   |                    ^^^^^^^^^^

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0658`.
[36/266] ACTION //build_extra/rust:rustls_rustc(//build/toolchain/mac:clang_x64)
ninja: build stopped: subcommand failed.

[7k8m]

rustup update and setup.py again, then resolved.

[7k8m]

Passed with rustc of next version.

[tomohito.nakayama@shorthair deno (master=)]$ rustc --version
rustc 1.36.0 (a53f9df32 2019-07-03)