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Diffstat (limited to 'pod/perldiag.pod')
| -rw-r--r-- | pod/perldiag.pod | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/pod/perldiag.pod b/pod/perldiag.pod index 1b67ccde28..5f6ed837f1 100644 --- a/pod/perldiag.pod +++ b/pod/perldiag.pod @@ -2627,18 +2627,24 @@ You may wish to switch to using L<Math::BigInt> explicitly. by that? lstat() makes sense only on filenames. (Perl did a fstat() instead on the filehandle.) -=item lvalue attribute cannot be removed after the subroutine has been defined +=item lvalue attribute %s already-defined subroutine -(W misc) The lvalue attribute on a Perl subroutine cannot be turned off -once the subroutine is defined. +(W misc) Although L<attributes.pm|attributes> allows this, turning the lvalue +attribute on or off on a Perl subroutine that is already defined +does not always work properly. It may or may not do what you +want, depending on what code is inside the subroutine, with exact +details subject to change between Perl versions. Only do this +if you really know what you are doing. =item lvalue attribute ignored after the subroutine has been defined -(W misc) Making a Perl subroutine an lvalue subroutine after it has been -defined, whether by declaring the subroutine with an lvalue attribute -or by using L<attributes.pm|attributes>, is not possible. To make the subroutine an -lvalue subroutine, add the lvalue attribute to the definition, or put -the declaration before the definition. +(W misc) Using the C<:lvalue> declarative syntax to make a Perl +subroutine an lvalue subroutine after it has been defined is +not permitted. To make the subroutine an lvalue subroutine, +add the lvalue attribute to the definition, or put the C<sub +foo :lvalue;> declaration before the definition. + +See also L<attributes.pm|attributes>. =item Malformed integer in [] in pack |