From c4cf781e24ac2941611eb63f1ee7c1d146cf4c06 Mon Sep 17 00:00:00 2001
From: Father Chrysostomos <sprout@cpan.org>
Date: Mon, 27 Jan 2014 18:07:45 -0800
Subject: [PATCH] [perl #121050] Teach B::Deparse about prototype whitespace

It has been hanging or unnecessarily using & since commit d16269d835
caused spaces to be preserved in the prototype and stripped when
applied during sub call compilation.  That commit did not update
B::Deparse accordingly.
---
 lib/B/Deparse.pm | 5 +++--
 lib/B/Deparse.t  | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/B/Deparse.pm b/lib/B/Deparse.pm
index 31ad998..f620db4 100644
--- a/lib/B/Deparse.pm
+++ b/lib/B/Deparse.pm
@@ -3698,8 +3698,9 @@ sub check_proto {
     my @reals;
     # An unbackslashed @ or % gobbles up the rest of the args
     1 while $proto =~ s/(?<!\\)([@%])[^\]]+$/$1/;
+    $proto =~ s/^\s*//;
     while ($proto) {
-	$proto =~ s/^(\\?[\$\@&%*_]|\\\[[\$\@&%*]+\]|;)//;
+	$proto =~ s/^(\\?[\$\@&%*_]|\\\[[\$\@&%*]+\]|;)\s*//;
 	my $chr = $1;
 	if ($chr eq "") {
 	    return "&" if @args;
@@ -3856,7 +3857,7 @@ sub pp_entersub {
 	my $dproto = defined($proto) ? $proto : "undefined";
         if (!$declared) {
 	    return "$kid(" . $args . ")";
-	} elsif ($dproto eq "") {
+	} elsif ($dproto =~ /^\s*\z/) {
 	    return $kid;
 	} elsif ($dproto eq "\$" and is_scalar($exprs[0])) {
 	    # is_scalar is an excessively conservative test here:
diff --git a/lib/B/Deparse.t b/lib/B/Deparse.t
index b0ecf39..c7af6a0 100644
--- a/lib/B/Deparse.t
+++ b/lib/B/Deparse.t
@@ -1428,3 +1428,12 @@ print f();
 ####
 # Elements of %# should not be confused with $#{ array }
 () = ${#}{'foo'};
+####
+# [perl #121050] Prototypes with whitespace
+sub _121050(\$ \$) { }
+_121050($a,$b);
+sub _121050empty( ) {}
+() = _121050empty() + 1;
+>>>>
+_121050 $a, $b;
+() = _121050empty + 1;
-- 
2.7.4