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File: //usr/share/systemtap/tapset/type_defined.stpm
@define type_defined(type) %(
    @defined(& @cast(0, @type))
%)

@define type_member_defined(type, member) %(
    @defined(& @cast(0, @type) -> @member)
%)

@define module_type_defined(module, type) %(
    @defined(& @cast(0, @type, @module))
%)

@define module_type_member_defined(module, type, member) %(
    @defined(& @cast(0, @type, @module) -> @member)
%)