You've just picked the wrong pair of delimeters. If you use (eg) [...] it's ok: 
qq[ $h->{  fn("{") =~ /c/ } ]

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qq will quote the first pair of matching delimeters. Which, in your case will be qq< $h->. Obviously, not what you want.

In reply to Re: Syntax allowed in interpolated hash/array indexes by FunkyMonk
in thread Syntax allowed in interpolated hash/array indexes by jrw

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