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use v6;
use Test;
plan 20;
# L<S04/The Relationship of Blocks and Declarations/A bare closure
# (except the block associated with a conditional statement)>
{
# test with explicit $_
my $f1 = { 2*$_ };
is $f1(2), 4, 'Block with explicit $_ has one formal parameter';
}
{
# test with implicit $_
my $f2 = { .sqrt };
is_approx $f2(4), 2, 'Block with implicit $_ has one formal parameter';
}
{
# { } has implicit signature ($_ is rw = $OUTER::_)
$_ = 'Hello';
is(try { { $_ }.() }, 'Hello', '$_ in bare block defaults to outer');
is({ $_ }.('Goodbye'), 'Goodbye', 'but it is only a default');
is({ 42 }.(), 42, 'no implicit $_ usage checking');
is({ 42 }.('Goodbye'), 42, '$_ gets assigned but is not used');
is(({ $_ }.arity), 0, '{$_} is arity 0, of course');
is(({ .say }.arity), 0, 'Blocks that uses $_ implicitly have arity 0');
is(({ $_ }.count), 1, '{$_} is count 1');
is(({ .say }.count), 1, 'Blocks that uses $_ implicitly have count 1');
}
{
$_ = 'Ack!';
dies-ok({ (-> { "Boo!" }).(42) }, '-> {} is arity 0');
dies-ok({ (-> { $_ }).(42) }, 'Even when we use $_>');
#?niecza todo
is((-> { $_ }).(), 'Ack!', '$_ is lexical here');
#?niecza todo
is(-> $a { $_ }.(42), 'Ack!', 'Even with parameters');
is(-> $_ { $_ }.(42), 42, 'But not when the parameter is $_');
eval-dies-ok( 'sub () { -> { $^a }.() }', 'Placeholders not allowed in ->');
is(-> { }.arity, 0, '->{} is arity 0, again');
}
{
eval-dies-ok('sub () { $^foo }.(42)', 'Placeholders not allowed in sub()');
}
# RT #114696
{
my $string;
$_ = 'Moo';
for .chars ... 1 -> $len {
$string ~= $_;
{ $string ~= $_; }
}
is $string, 'MooMooMooMooMooMoo', 'outer $_ is seen within nested blocks';
}
# RT #125767
{
is (1.map: { .sqrt => .sqrt }), (1 => 1), 'hash like block with implicit parameter'
}
# vim: ft=perl6
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