A warning to anybody who finds this from google.
This approach worked perfectly in perl 5.8.8 and perl 5.20.2, but as of perl 5.30.3, this no longer works.
At that version, "$gv->LINE" outputs some huge number instead of a LINE number.
Somehow using "x $sub" in the debugger still gets the correct answer, so I think there must be some solution.
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