Running perlcritic with gentle severity reports six problems.  The
following lists the line numbers on which the problems occur, along
with a description of the problem.  This patch fixes them all, after
carefully considering the consequences.

516: Contrary to common belief, subroutine prototypes do not enable
compile-time checks for proper arguments.  They serve the singular
purpose of defining functions that behave like built-in functions, but
check_file_rev_conflict was never intended to behave like one.  We
have verified that the callers of the subroutines are alright with the

714, 836, 855, 1487: Returning `undef' upon failure from a subroutine
is pretty common. But if the subroutine is called in list context, an
explicit `return undef;' statement will return a one-element list
containing `(undef)'. Now if that list is subsequently put in a
boolean context to test for failure, then it evaluates to true. But
you probably wanted it to be false.  The solution is to just use a
bare `return' statement whenever you want to return failure. In list
context, Perl will then give you an empty list (which is false), and
`undef' in scalar context (which is also false).

1441: The three-argument form of `open' (introduced in Perl 5.6)
prevents subtle bugs that occur when the filename starts with funny
characters like '>' or '<'.  It's also more explicitly clear to define
the input mode of the file.  This policy will not complain if the file
explicitly states that it is compatible with a version of Perl prior
to 5.6 via an include statement (see 'use 5.008' near the top of the

Signed-off-by: Ramkumar Ramachandra <>
 Junio: In future, please tell me explicitly that you're expecting a
 re-roll with an updated commit message.  It wasn't obvious to me at

 git-send-email.perl | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index c3501d9..633f447 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -513,7 +513,7 @@ if (@alias_files and $aliasfiletype and defined 
$parse_alias{$aliasfiletype}) {
 ($sender) = expand_aliases($sender) if defined $sender;
 # returns 1 if the conflict must be solved using it as a format-patch argument
-sub check_file_rev_conflict($) {
+sub check_file_rev_conflict {
        return unless $repo;
        my $f = shift;
        try {
@@ -711,7 +711,7 @@ sub ask {
-       return undef;
+       return;
 my %broken_encoding;
@@ -833,7 +833,7 @@ sub extract_valid_address {
        # less robust/correct than the monster regexp in Email::Valid,
        # but still does a 99% job, and one less dependency
        return $1 if $address =~ /($local_part_regexp\@$domain_regexp)/;
-       return undef;
+       return;
 sub extract_valid_address_or_die {
@@ -852,7 +852,7 @@ sub validate_address {
                        valid_re => qr/^(?:quit|q|drop|d|edit|e)/i,
                        default => 'q');
                if (/^d/i) {
-                       return undef;
+                       return;
                } elsif (/^q/i) {
@@ -1453,7 +1453,7 @@ sub recipients_cmd {
        my $sanitized_sender = sanitize_address($sender);
        my @addresses = ();
-       open my $fh, "$cmd \Q$file\E |"
+       open my $fh, q{-|}, "$cmd \Q$file\E"
            or die "($prefix) Could not execute '$cmd'";
        while (my $address = <$fh>) {
                $address =~ s/^\s*//g;
@@ -1499,7 +1499,7 @@ sub validate_patch {
                        return "$.: patch contains a line longer than 998 
-       return undef;
+       return;
 sub file_has_nonascii {

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