X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperltrap.pod;h=02abc3b03b3852526578fb132c30c56fb6e2ee66;hb=ce3f0a3cd6f30cb49f01b7811c2891acb7bab15a;hp=786dcda6074abc0253494e2f11864f9e233a7d98;hpb=daff0e373f3630eaa9dbded0adcc04185f454487;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perltrap.pod b/pod/perltrap.pod
index 786dcda..02abc3b 100644
--- a/pod/perltrap.pod
+++ b/pod/perltrap.pod
@@ -35,7 +35,7 @@ Curly brackets are required on C<if>s and C<while>s.
 
 =item *
 
-Variables begin with "$" or "@" in Perl.
+Variables begin with "$", "@" or "%" in Perl.
 
 =item *
 
@@ -168,7 +168,7 @@ There's no switch statement.  (But it's easy to build one on the fly.)
 
 =item *
 
-Variables begin with "$" or "@" in Perl.
+Variables begin with "$", "@" or "%" in Perl.
 
 =item *
 
@@ -438,6 +438,12 @@ whether this should be classed as a bug or not.
     # perl4 prints: x=10
     # perl5 prints: Can't find string terminator "'" anywhere before EOF
 
+You can avoid this problem, and remain compatible with perl4, if you
+always explicitly include the package name:
+
+    $x = 10 ;
+    print "x=${main'x}\n" ;
+
 Also see precedence traps, for parsing C<$:>.
 
 =item * BugFix
@@ -923,7 +929,9 @@ Perl4-to-Perl5 traps involving precedence order.
 
 =item * Precedence
 
-LHS vs. RHS when both sides are getting an op.
+LHS vs. RHS of any assignment operator.  LHS is evaluated first
+in perl4, second in perl5; this can affect the relationship
+between side-effects in sub-expressions.
 
     @arr = ( 'left', 'right' );
     $a{shift @arr} = shift @arr;
@@ -999,18 +1007,6 @@ concatenation precedence over filetest operator?
     # perl4 prints: no output
     # perl5 prints: Can't modify -e in concatenation
 
-=item * Precedence
-
-Assignment to value takes precedence over assignment to key in
-perl5 when using the shift operator on both sides.
-
-    @arr = ( 'left', 'right' );
-    $a{shift @arr} = shift @arr;
-    print join( ' ', keys %a );
-
-    # perl4 prints: left
-    # perl5 prints: right
-
 =back
 
 =head2 General Regular Expression Traps using s///, etc.
@@ -1455,9 +1451,7 @@ Everything else.
 
 =over 5
 
-=item * Unclassified
-
-C<require>/C<do> trap using returned value
+=item * C<require>/C<do> trap using returned value
 
 If the file doit.pl has:
 
@@ -1478,6 +1472,14 @@ Running doit.pl gives the following:
 
 Same behavior if you replace C<do> with C<require>.
 
+=item * C<split> on empty string with LIMIT specified
+
+	$string = '';
+    @list = split(/foo/, $string, 2)
+
+Perl4 returns a one element list containing the empty string but Perl5
+returns an empty list.
+
 =back
 
 As always, if any of these are ever officially declared as bugs,