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-rw-r--r--pod/perldiag.pod5
1 files changed, 5 insertions, 0 deletions
diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index eb84876d4e..6594e0cae9 100644
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -51,6 +51,11 @@ no useful value. See L<perlmod>.
(F) The "use" keyword is recognized and executed at compile time, and returns
no useful value. See L<perlmod>.
+=item '_' allowed only after types %s
+
+(F) The '_' is allowed in pack() and unpack() only after certain types.
+See L<perlfunc>.
+
=item % may only be used in unpack
(F) You can't pack a string by supplying a checksum, because the