brew install dart

zl@0xra1n:~$     brew install dart -v
==> Installing dart from dart-lang/dart
/usr/bin/sandbox-exec -f /private/tmp/homebrew20200724-90765-pkqjrf.sb nice ruby -W0 -I $LOAD_PATH -- /usr/local/Homebrew/Library/Homebrew/build.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb --verbose
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.4/sdk/dartsdk-macos-x64-release.zip
/usr/bin/curl --disable --globoff --show-error --user-agent Homebrew/2.2.13\ \(Macintosh\;\ Intel\ Mac\ OS\ X\ 10.15.6\)\ curl/7.64.1 --fail --retry 3 --location --remote-time --continue-at 0 --output /Users/zl/Library/Caches/Homebrew/downloads/cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip.incomplete https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.4/sdk/dartsdk-macos-x64-release.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:02:59 --:--:--     0
curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to storage.googleapis.com:443 
Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "dart"
Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.4/sdk/dartsdk-macos-x64-release.zip

zl@0xra1n:~$     mv /Users/zl/Downloads/dartsdk-macos-x64-release.zip /Users/zl/Library/Caches/Homebrew/downloads/cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip
zl@0xra1n:~$     brew install dart -v
==> Installing dart from dart-lang/dart
/usr/bin/sandbox-exec -f /private/tmp/homebrew20200724-91519-2p4do7.sb nice ruby -W0 -I $LOAD_PATH -- /usr/local/Homebrew/Library/Homebrew/build.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb --verbose
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.4/sdk/dartsdk-macos-x64-release.zip
Already downloaded: /Users/zl/Library/Caches/Homebrew/downloads/cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip
==> Verifying cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip checksum
unzip -o /Users/zl/Library/Caches/Homebrew/downloads/cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip -d /private/tmp/d20200724-91520-174m0y6
cp -pR /private/tmp/d20200724-91520-174m0y6/dart-sdk/. /private/tmp/dart-20200724-91520-33v8ur/dart-sdk
chmod -Rf +w /private/tmp/d20200724-91520-174m0y6
==> Cleaning
==> Finishing up
ln -s ../Cellar/dart/2.8.4/bin/dart dart
ln -s ../Cellar/dart/2.8.4/bin/dart2js dart2js
ln -s ../Cellar/dart/2.8.4/bin/dart2native dart2native
ln -s ../Cellar/dart/2.8.4/bin/dartanalyzer dartanalyzer
ln -s ../Cellar/dart/2.8.4/bin/dartaotruntime dartaotruntime
ln -s ../Cellar/dart/2.8.4/bin/dartdevc dartdevc
ln -s ../Cellar/dart/2.8.4/bin/dartdoc dartdoc
ln -s ../Cellar/dart/2.8.4/bin/dartfmt dartfmt
ln -s ../Cellar/dart/2.8.4/bin/pub pub
/usr/bin/sandbox-exec -f /private/tmp/homebrew20200724-91622-1s7xwwa.sb nice ruby -W0 -I $LOAD_PATH -- /usr/local/Homebrew/Library/Homebrew/postinstall.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb
==> Caveats
Please note the path to the Dart SDK:
  /usr/local/opt/dart/libexec
==> Summary
🍺  /usr/local/Cellar/dart/2.8.4: 502 files, 486MB, built in 1 minute 54 seconds
zl@0xra1n:~$     dart --version
Dart VM version: 2.8.4 (stable) (Wed Jun 3 12:26:04 2020 +0200) on "macos_x64"