UndefVarError for closure defined in a function

You used different, though similar-looking, Unicode characters. Here’s a hex view:

$ printf %s 'θ′' | xd
0000000  ceb8e280 b2000000
0000005 
$ printf %s 'Θ′' | xd
0000000  ce98e280 b2000000
0000005

BTW, what is “EM”?

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