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perlsub: correct pre-postderef language about "starts with" #23768

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Sep 28, 2025
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perlsub: correct pre-postderef language about "starts with" #23768

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19 changes: 15 additions & 4 deletions pod/perlsub.pod
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Original file line number Diff line number Diff line change
Expand Up @@ -1523,10 +1523,21 @@ corresponding built-in.
sub mytime () mytime

Any backslashed prototype character represents an actual argument
that must start with that character (optionally preceded by C<my>,
C<our> or C<local>), with the exception of C<$>, which will
accept any scalar lvalue expression, such as C<$foo = 7> or
C<< my_function()->[0] >>. The value passed as part of C<@_> will be a
really using that character for type, with the exception of C<$>, which will
accept any scalar lvalue expression, such as C<$foo = 7> or C<<
my_function()->[0] >>. "Using that character for type" means that the
expression I<begins> with the sigil (optionally preceded by a declarator like
C<my>) or I<ends> with the sigil's postfix dereference form. Any of these, for
example, satisfies C<\%>:

%hash
%$hashref
my %hash
$hashref->%*
%{ expr }
(expr)->*%

The value passed as part of C<@_> will be a
reference to the actual argument given in the subroutine call,
obtained by applying C<\> to that argument.

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