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--TEST--
A generator can only be rewinded before or at the first yield
--FILE--
<?php
function gen() {
echo "before yield\n";
yield;
echo "after yield\n";
yield;
}
$gen = gen();
$gen->rewind();
$gen->rewind();
$gen->next();
try {
$gen->rewind();
} catch (Exception $e) {
echo "\n", $e, "\n\n";
}
function &gen2() {
$foo = 'bar';
yield $foo;
yield $foo;
}
$gen = gen2();
foreach ($gen as $v) { }
try {
foreach ($gen as $v) { }
} catch (Exception $e) {
echo $e, "\n\n";
}
function gen3() {
echo "in generator\n";
if (false) yield;
}
$gen = gen3();
$gen->rewind();
?>
--EXPECTF--
before yield
after yield
exception 'Exception' with message 'Cannot rewind a generator that was already run' in %s:%d
Stack trace:
#0 %s(%d): Generator->rewind()
#1 {main}
exception 'Exception' with message 'Cannot traverse an already closed generator' in %s:%d
Stack trace:
#0 %s(%d): unknown()
#1 {main}
in generator
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