This file is indexed.

/usr/share/systemtap/tapset/choose_defined.stpm is in systemtap-common 2.3-1ubuntu1.

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The actual contents of the file can be viewed below.

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// Use the first parameter if it's @defined, otherwise use the second parameter
@define choose_defined(value_if_defined, alternate) %(
	( @defined(@value_if_defined) ? (@value_if_defined) : (@alternate) )
%)