Pin to an older nightly to fix CI

Author: alexcrichton

azure-pipelines.yml

@@ -76,7 +76,7 @@ jobs:
     steps:
       - template: ci/azure-install-rust.yml
         parameters:
-          toolchain: nightly
+          toolchain: nightly-2020-05-24
       - template: ci/azure-install-node.yml
       - script: cargo test --target wasm32-unknown-unknown --features nightly --test wasm
 
@@ -276,7 +276,7 @@ jobs:
     steps:
       - template: ci/azure-install-rust.yml
         parameters:
-          toolchain: nightly
+          toolchain: nightly-2020-05-24
       - script: cargo doc --no-deps --features 'nightly serde-serialize'
         displayName: "Document wasm-bindgen"
       - script: cargo doc --no-deps --manifest-path crates/js-sys/Cargo.toml

examples/raytrace-parallel/build.sh

@@ -18,7 +18,7 @@ set -ex
 #   and put it in PATH
 
 RUSTFLAGS='-C target-feature=+atomics,+bulk-memory' \
-  cargo build -v --target wasm32-unknown-unknown --release -Z build-std=std,panic_abort
+  cargo build --target wasm32-unknown-unknown --release -Z build-std=std,panic_abort
 
 # Note the usage of `--no-modules` here which is used to create an output which
 # is usable from Web Workers. We notably can't use `--target bundler` since