我想安装dart环境，所以：

 brew tap dart-lang/dart
 brew install dart

然后报错：

==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/rele
#=#=# 
curl: (35) error:1400410B:SSL routines:CONNECT_CR_SRVR_HELLO:wrong version number
Error: 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

google后的解决办法，将需要下载的“https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.4/sdk/dartsdk-macos-x64-release.zip”手动下载，放到homebrew的缓存路径，尝试后也不行。

解决办法

在brew install dart后加-v

chenxin@JUGGCHEN-MB0 Applications % brew install dart -v
==> Installing dart from dart-lang/dart
==> 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/2.4.3\ \(Macintosh\;\ Intel\ Mac\ OS\ X\ 10.15.3\)\ curl/7.64.1 --fail --retry 3 --location --remote-time --continue-at 0 --output /Users/chenxin/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 --:--:-- --:--:-- --:--:--     0curl: (35) error:1400410B:SSL routines:CONNECT_CR_SRVR_HELLO:wrong version number
Error: 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

会看到--output /Users/chenxin/Library/Caches/Homebrew/downloads/cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip.incomplete，然后把刚刚下载的文件放到这个文件夹下，并且改成这个名字cc890b64dedeca4d34ac8849fc5d9aedd2398d0bcd4b4c5b3aeee911fa8c9656--dartsdk-macos-x64-release.zip.incomplete（注意：你的电脑上不是这个名字，也不是这个路径），再执行brew install dart就成功了。