make ~$x give warning is $x isn't initialised.

Also add test for uninitialised warning in & op.

p4raw-id: //depot/perl@22525

2 files changed, 21 insertions, 0 deletions

diff --git a/pp.c b/pp.c
index 8b485fda1f..866d55459e 100644
--- a/pp.c
+++ b/pp.c
@@ -2377,6 +2377,7 @@ PP(pp_complement)
 	register I32 anum;
 	STRLEN len;
 
+	(void)SvPV_nomg(sv,len);
 	sv_setsv_nomg(TARG, sv);
 	tmps = (U8*)SvPV_force(TARG, len);
 	anum = len;
diff --git a/t/lib/warnings/sv b/t/lib/warnings/sv
index 6060fbc38d..b38200d4c8 100644
--- a/t/lib/warnings/sv
+++ b/t/lib/warnings/sv
@@ -112,6 +112,26 @@ Use of uninitialized value in bitwise or (|) at - line 4.
 ########
 # sv.c
 use warnings 'uninitialized' ;
+my $Y = 1 ; 
+my $x = 1 & $a[$Y] ;
+no warnings 'uninitialized' ;
+my $Y = 1 ; 
+$x = 1 & $b[$Y] ;
+EXPECT
+Use of uninitialized value in bitwise and (&) at - line 4.
+########
+# sv.c
+use warnings 'uninitialized' ;
+my $Y = 1 ; 
+my $x = ~$a[$Y] ;
+no warnings 'uninitialized' ;
+my $Y = 1 ; 
+$x = ~$b[$Y] ;
+EXPECT
+Use of uninitialized value in 1's complement (~) at - line 4.
+########
+# sv.c
+use warnings 'uninitialized' ;
 my $x *= 1 ; # d
 no warnings 'uninitialized' ;
 my $y *= 1 ; # d