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Diffstat (limited to 'pod/perlrun.pod')
| -rw-r--r-- | pod/perlrun.pod | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/pod/perlrun.pod b/pod/perlrun.pod index e6c8f73fce..2b63c6b056 100644 --- a/pod/perlrun.pod +++ b/pod/perlrun.pod @@ -918,6 +918,8 @@ emphasise their similarity to variable "attributes". But the code that parses layer specification strings (which is also used to decode the PERLIO environment variable) treats the colon as a separator. +An unset or empty PERLIO is equivalent to C<:stdio>. + The list becomes the default for I<all> perl's IO. Consequently only built-in layers can appear in this list, as external layers (such as :encoding()) need IO in order to load them!. See L<"open pragma"|open> for how to add external |