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use v6;
use Test;
plan 7;
# L<S06/"Parameter traits"/"=item is rw">
{
sub foo($a is rw) {
$a = 42;
return 19;
}
my $bar = 23;
is $bar, 23, "basic sanity";
is foo($bar), 19, "calling a sub with an is rw param";
is $bar, 42, "sub changed our variable";
# RT #74830
dies-ok { EVAL('foo(28)') }, 'is rw requires a variable';
}
{
my $anon = -> $a is rw { $a++ };
my $bar = 10;
$anon.($bar);
is($bar, 11, "anon sub changed variable");
}
# See thread "is rw basically a null-op on objects/references?" on p6l
# L<"http://www.nntp.perl.org/group/perl.perl6.language/20671">
{
my %hash = (a => 23);
# First check .value = ... works (as this is a dependency for the next test)
try { %hash.pairs[0].value = 42 };
#?rakudo todo 'RT #124640'
is %hash<a>, 42, "pairs are mutable";
for %hash.pairs -> $pair { # Note: No "is rw"!
try { $pair.value += 100 }; # Modifies %hash
}
#?rakudo todo 'Depends on preceding test working RT #124640'
is %hash<a>, 142, "'is rw' not necessary on objects/references";
}
# for ... -> ... is rw {...} already tested for in t/statements/for.t.
# vim: ft=perl6
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