git grep -l '^shared_examples' | xargs gsed -i 's|^shared_examples|RSpec.shared_examples|g'

Library/Homebrew/test/cask/artifact/shared_examples/uninstall_zap.rb

@@ -2,7 +2,7 @@
 
 require "benchmark"
 
-shared_examples "#uninstall_phase or #zap_phase" do
+RSpec.shared_examples "#uninstall_phase or #zap_phase" do
   subject { artifact }
 
   let(:artifact_dsl_key) { described_class.dsl_key }

Library/Homebrew/test/cask/dsl/shared_examples/base.rb

@@ -2,7 +2,7 @@
 
 require "cask/dsl/base"
 
-shared_examples Cask::DSL::Base do
+RSpec.shared_examples Cask::DSL::Base do
   it "supports the token method" do
     expect(dsl.token).to eq(cask.token)
   end

Library/Homebrew/test/cask/dsl/shared_examples/staged.rb

@@ -2,7 +2,7 @@
 
 require "cask/staged"
 
-shared_examples Cask::Staged do
+RSpec.shared_examples Cask::Staged do
   let(:existing_path) { Pathname("/path/to/file/that/exists") }
   let(:non_existent_path) { Pathname("/path/to/file/that/does/not/exist") }
 

Library/Homebrew/test/cmd/shared_examples/args_parse.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-shared_examples "parseable arguments" do
+RSpec.shared_examples "parseable arguments" do
   subject(:method_name) { "#{command_name.tr("-", "_")}_args" }
 
   let(:command_name) do |example|

Library/Homebrew/test/support/helper/spec/shared_examples/formulae_exist.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-shared_examples "formulae exist" do |array|
+RSpec.shared_examples "formulae exist" do |array|
   array.each do |f|
     it "#{f} formula exists" do
       core_tap = Pathname("#{HOMEBREW_LIBRARY_PATH}/../Taps/homebrew/homebrew-core")

Library/Homebrew/test/unpack_strategy/shared_examples.rb

@@ -2,13 +2,13 @@
 
 require "unpack_strategy"
 
-shared_examples "UnpackStrategy::detect" do
+RSpec.shared_examples "UnpackStrategy::detect" do
   it "is correctly detected" do
     expect(UnpackStrategy.detect(path)).to be_a described_class
   end
 end
 
-shared_examples "#extract" do |children: []|
+RSpec.shared_examples "#extract" do |children: []|
   specify "#extract" do
     mktmpdir do |unpack_dir|
       described_class.new(path).extract(to: unpack_dir)