Skip 'yield to subst context' tests on perl 5.8 and below

[perl/modules/Scope-Upper.git] / t / 58-yield-misc.t

diff --git a/t/58-yield-misc.t b/t/58-yield-misc.t
index 23fc1d4967fc696dd1fcde037886db0ec52cc183..3243272da8fcd30f8383803de941d568717ca0a4 100644 (file)
--- a/t/58-yield-misc.t
+++ b/t/58-yield-misc.t
@@ -3,12 +3,12 @@
 use strict;
 use warnings;
 
-use Test::More tests => 4 * 3;
+use Test::More tests => 4 * 3 + 1 + 3;
 
 use lib 't/lib';
 use VPIT::TestHelpers;
 
-use Scope::Upper qw<yield HERE>;
+use Scope::Upper qw<yield leave HERE>;
 
 # Test timely destruction of values returned from yield()
 
@@ -74,3 +74,64 @@ sub guard { VPIT::TestHelpers::Guard->new(sub { ++$destroyed }) }
  }
  is $destroyed, 1, "$desc: destroyed 2";
 }
+
+# Test 'return from do' in special cases
+
+{
+ no warnings 'void';
+ my @res = (1, do {
+  my $cxt = HERE;
+  my $thing = (777, do {
+   my @stuff = (888, do {
+    yield 2, 3 => $cxt;
+    map { my $x; $_ x 3 } qw<x y z>
+   }, 999);
+   if (@stuff) {
+    my $y;
+    ++$y;
+    'YYY';
+   } else {
+    die 'not reached';
+   }
+  });
+  if (1) {
+   my $z;
+   'ZZZ';
+  }
+  'VVV'
+ }, 4);
+ is "@res", '1 2 3 4', 'yield() found the op to return to';
+}
+
+# Test leave
+
+{
+ my @res = (1, do {
+  leave;
+  'XXX';
+ }, 2);
+ is "@res", '1 2', 'leave without arguments';
+}
+
+{
+ my @res = (1, do {
+  leave 2, 3;
+  'XXX';
+ }, 4);
+ is "@res", '1 2 3 4', 'leave with arguments';
+}
+
+SKIP: {
+ skip '"eval { $str =~ s/./die q[foo]/e }" breaks havoc on perl 5.8 and below'
+                                                           => 1 if "$]" < 5.010;
+ my $s = 'a';
+ local $@;
+ eval {
+  $s =~ s/./leave; die 'not reached'/e;
+ };
+ my $err  = $@;
+ my $line = __LINE__-3;
+ like $err,
+      qr/^leave\(\) can't target a substitution context at \Q$0\E line $line/,
+      'leave() cannot exit subst';
+}