subroutine signatures

Declarative syntax to unwrap argument list into lexical variables.
"sub foo ($a,$b) {...}" checks number of arguments and puts the
arguments into lexical variables.  Signatures are not equivalent to the
existing idiom of "sub foo { my($a,$b) = @_; ... }".  Signatures are only
available by enabling a non-default feature, and generate warnings about
being experimental.  The syntactic clash with prototypes is managed by
disabling the short prototype syntax when signatures are enabled.

1 files changed, 2 insertions, 0 deletions

diff --git a/pod/perllexwarn.pod b/pod/perllexwarn.pod
index 229a357997..de980201f4 100644
--- a/pod/perllexwarn.pod
+++ b/pod/perllexwarn.pod
@@ -239,6 +239,8 @@ will be lost.
          |                 |
          |                 +- experimental::regex_sets
          |                 |
+         |                 +- experimental::signatures
+         |                 |
          |                 +- experimental::smartmatch
          |
          +- glob