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So here is an answer to Rojo's interpretation (which I agree with) of that question: Select[Names["Global`*"], (First[ToBoxes@Definition[#]] === "Null") &] Replace "Global`" with context of interest. Maybe doesn't look neat but works well so far. It is based on an assumption that Definition of a symbol without any values will return Interpretation[...
I think that's a fair answer to this topic, which doesn't really state any question precisely. Also, hard to find more authoritative source. This just isn't supported in the FrontEnd. The FE tries very hard not to put unreadable typesetting markup into packages to facilitate easy exchange with other programming editors. Possibly workarounds......
Needs["GeneralUtilities`"]; PrintDefinitions[testFunction] More methods here: 1742
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