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raise 'should be run without RubyGems' if defined?(Gem)
def deprecated(n=1)
# puts nil, caller(0), nil
warn "use X instead", uplevel: n
end
1.times do # to test with a non-empty stack above the reported locations
deprecated
tap(&:deprecated)
tap { deprecated(2) }
# eval sources with a <internal: file are also ignored
eval "tap(&:deprecated)", nil, "<internal:should-be-skipped-by-warn-uplevel>"
end
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