[PATCH] Eliminate Scalar::Util usage from private-Error.pm

[Petr Baudis <pasky@suse.cz>]

We used just the blessed() routine so steal it from Scalar/Util.pm. ;-)
(Unfortunately, Scalar::Util is not bundled with older Perl versions.)

Signed-off-by: Petr Baudis <pasky@suse.cz>
---

 perl/private-Error.pm |   20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/perl/private-Error.pm b/perl/private-Error.pm
index ebd0749..848e82b 100644
--- a/perl/private-Error.pm
+++ b/perl/private-Error.pm
@@ -43,8 +43,6 @@ sub throw_Error_Simple
 
 # Exported subs are defined in Error::subs
 
-use Scalar::Util ();
-
 sub import {
     shift;
     local $Exporter::ExportLevel = $Exporter::ExportLevel + 1;
@@ -290,6 +288,20 @@ use vars qw(@EXPORT_OK @ISA %EXPORT_TAGS
 
 @ISA = qw(Exporter);
 
+
+# Stolen from Scalar::Util:
+
+# Hope nobody defines a sub by this name
+sub UNIVERSAL::a_sub_not_likely_to_be_here { ref($_[0]) }
+
+sub blessed ($) {
+    local($@, $SIG{__DIE__}, $SIG{__WARN__});
+    length(ref($_[0]))
+        ? eval { $_[0]->a_sub_not_likely_to_be_here }
+        : undef
+}
+
+
 sub run_clauses ($$$\@) {
     my($clauses,$err,$wantarray,$result) = @_;
     my $code = undef;
@@ -312,7 +324,7 @@ sub run_clauses ($$$\@) {
 		    $i -= 2;
 		    next CATCHLOOP;
 		}
-		elsif(Scalar::Util::blessed($err) && $err->isa($pkg)) {
+		elsif(blessed($err) && $err->isa($pkg)) {
 		    $code = $catch->[$i+1];
 		    while(1) {
 			my $more = 0;
@@ -421,7 +433,7 @@ sub try (&;$) {
 
     if (defined($err))
     {
-        if (Scalar::Util::blessed($err) && $err->can('throw'))
+        if (blessed($err) && $err->can('throw'))
         {
             throw $err;
         }