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//usr/local/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/ext/core.rb
class Module # Check for an existing method in the current class before extending. If # the method already exists, then a warning is printed and the extension is # not added. Otherwise the block is yielded and any definitions in the # block will take effect. # # Usage: # # class String # rake_extension("xyz") do # def xyz # ... # end # end # end # def rake_extension(method) # :nodoc: if method_defined?(method) $stderr.puts "WARNING: Possible conflict with Rake extension: " + "#{self}##{method} already exists" else yield end end end