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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
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