1 files changed, 105 insertions, 0 deletions
diff --git a/lib/vars.t b/lib/vars.t
new file mode 100644
index 0000000000..3075f8e5ff
--- /dev/null
+++ b/lib/vars.t
@@ -0,0 +1,105 @@
+#!./perl 
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+    $ENV{PERL5LIB} = '../lib';
+}
+
+$| = 1;
+
+print "1..27\n";
+
+# catch "used once" warnings
+my @warns;
+BEGIN { $SIG{__WARN__} = sub { push @warns, @_ }; $^W = 1 };
+
+%x = ();
+$y = 3;
+@z = ();
+$X::x = 13;
+
+use vars qw($p @q %r *s &t $X::p);
+
+my $e = !(grep /^Name "X::x" used only once: possible typo/, @warns) && 'not ';
+print "${e}ok 1\n";
+$e = !(grep /^Name "main::x" used only once: possible typo/, @warns) && 'not ';
+print "${e}ok 2\n";
+$e = !(grep /^Name "main::y" used only once: possible typo/, @warns) && 'not ';
+print "${e}ok 3\n";
+$e = !(grep /^Name "main::z" used only once: possible typo/, @warns) && 'not ';
+print "${e}ok 4\n";
+($e, @warns) = @warns != 4 && 'not ';
+print "${e}ok 5\n";
+
+# this is inside eval() to avoid creation of symbol table entries and
+# to avoid "used once" warnings
+eval <<'EOE';
+$e = ! $main::{p} && 'not ';
+print "${e}ok 6\n";
+$e = ! *q{ARRAY} && 'not ';
+print "${e}ok 7\n";
+$e = ! *r{HASH} && 'not ';
+print "${e}ok 8\n";
+$e = ! $main::{s} && 'not ';
+print "${e}ok 9\n";
+$e = ! *t{CODE} && 'not ';
+print "${e}ok 10\n";
+$e = defined $X::{q} && 'not ';
+print "${e}ok 11\n";
+$e = ! $X::{p} && 'not ';
+print "${e}ok 12\n";
+EOE
+$e = $@ && 'not ';
+print "${e}ok 13\n";
+
+eval q{use vars qw(@X::y !abc); $e = ! *X::y{ARRAY} && 'not '};
+print "${e}ok 14\n";
+$e = $@ !~ /^'!abc' is not a valid variable name/ && 'not ';
+print "${e}ok 15\n";
+
+eval 'use vars qw($x[3])';
+$e = $@ !~ /^Can't declare individual elements of hash or array/ && 'not ';
+print "${e}ok 16\n";
+
+{ local $^W;
+  eval 'use vars qw($!)';
+  ($e, @warns) = ($@ || @warns) ? 'not ' : '';
+  print "${e}ok 17\n";
+};
+
+# NB the next test only works because vars.pm has already been loaded
+eval 'use warnings "vars"; use vars qw($!)';
+$e = ($@ || (shift(@warns)||'') !~ /^No need to declare built-in vars/)
+			&& 'not ';
+print "${e}ok 18\n";
+
+no strict 'vars';
+eval 'use vars qw(@x%%)';
+$e = $@ && 'not ';
+print "${e}ok 19\n";
+$e = ! *{'x%%'}{ARRAY} && 'not ';
+print "${e}ok 20\n";
+eval '$u = 3; @v = (); %w = ()';
+$e = $@ && 'not ';
+print "${e}ok 21\n";
+
+use strict 'vars';
+eval 'use vars qw(@y%%)';
+$e = $@ !~ /^'\@y%%' is not a valid variable name under strict vars/ && 'not ';
+print "${e}ok 22\n";
+$e = *{'y%%'}{ARRAY} && 'not ';
+print "${e}ok 23\n";
+eval '$u = 3; @v = (); %w = ()';
+my @errs = split /\n/, $@;
+$e = @errs != 3 && 'not ';
+print "${e}ok 24\n";
+$e = !(grep(/^Global symbol "\$u" requires explicit package name/, @errs))
+			&& 'not ';
+print "${e}ok 25\n";
+$e = !(grep(/^Global symbol "\@v" requires explicit package name/, @errs))
+			&& 'not ';
+print "${e}ok 26\n";
+$e = !(grep(/^Global symbol "\%w" requires explicit package name/, @errs))
+			&& 'not ';
+print "${e}ok 27\n";