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It seems the documentation uses the term "subroutine name" in quite a confusing way. Check the examples:
Use of a subroutine call, rather than a subroutine name, as an argument to exists is an error.
exists ⊂ # OK exists &sub(); # Error

So, in this context, "subroutine name" includes the ampersand.

Considering strict, note the exceptions to strict 'refs':

$bar = \&{'foo'}; &$bar;
We are not calling the subroutine, we're just checking it exists/is defined.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^3: Test if a string is a sub name by choroba
in thread Test if a string is a sub name by clscott

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