[PATCH 1/4] mid+contenthash: eliminate needless local variable captures

[Eric Wong <e@80x24.org>]

It's possible in theory that Perl could be smarter and free
memory a tad sooner this way.  Regardless, fewer lines of code
is easier-to-navigate/read and can save optree size and reduce
parsing times.
---
 lib/PublicInbox/ContentHash.pm | 6 ++----
 lib/PublicInbox/MID.pm         | 6 ++----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/lib/PublicInbox/ContentHash.pm b/lib/PublicInbox/ContentHash.pm
index d3ff146a..a4f6196f 100644
--- a/lib/PublicInbox/ContentHash.pm
+++ b/lib/PublicInbox/ContentHash.pm
@@ -76,8 +76,7 @@ sub content_digest ($;$) {
 		last;
 	}
 	foreach my $h (qw(Subject Date)) {
-		my @v = $eml->header($h);
-		foreach my $v (@v) {
+		for my $v ($eml->header($h)) {
 			utf8::encode($v);
 			$dig->add("$h\0$v\0");
 		}
@@ -86,8 +85,7 @@ sub content_digest ($;$) {
 	# not in the original message.  For the purposes of deduplication,
 	# do not take it into account:
 	foreach my $h (qw(To Cc)) {
-		my @v = $eml->header($h);
-		digest_addr($dig, $h, $_) foreach @v;
+		digest_addr($dig, $h, $_) for ($eml->header($h));
 	}
 	msg_iter($eml, \&content_dig_i, $dig);
 	$dig;
diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 4819cc25..b1ae9939 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -92,8 +92,7 @@ sub references ($) {
 	my ($hdr) = @_;
 	my @mids;
 	foreach my $f (qw(References In-Reply-To)) {
-		my @v = $hdr->header_raw($f);
-		foreach my $v (@v) {
+		for my $v ($hdr->header_raw($f)) {
 			push(@mids, ($v =~ /$MID_EXTRACT/g));
 		}
 	}
@@ -104,8 +103,7 @@ sub references ($) {
 	my %addr = ( y => 1, n => 1 );
 
 	foreach my $f (qw(To From Cc)) {
-		my @v = $hdr->header_raw($f);
-		foreach my $v (@v) {
+		for my $v ($hdr->header_raw($f)) {
 			$addr{$_} = 1 for (PublicInbox::Address::emails($v));
 		}
 	}