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irb使用Homebrew安装Ruby后如何工作？

当我尝试运行时irb，出现错误：

$ irb
Traceback (most recent call last):
    2: from /usr/local/opt/ruby/bin/irb:23:in `<main>'
    1: from /usr/local/lib/ruby/site_ruby/2.6.0/rubygems.rb:302:in `activate_bin_path'
/usr/local/lib/ruby/site_ruby/2.6.0/rubygems.rb:283:in `find_spec_for_exe': can't find gem irb (>= 0.a) with executable irb (Gem::GemNotFoundException)

我试过了：

$ brew link ruby
Warning: Refusing to link macOS-provided software: ruby
If you need to have ruby first in your PATH run:
  echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile

For compilers to find ruby you may need to set:
  export LDFLAGS="-L/usr/local/opt/ruby/lib"
  export CPPFLAGS="-I/usr/local/opt/ruby/include"

我的/etc/paths文件顶部下面有几行：

/usr/local/bin
/usr/local/opt/ruby/bin
/usr/local/lib/ruby/gems/2.6.0/bin …