Add support for yielding keys

Keys are yielded using the

    yield $key => $value

syntax. Currently this is implemented as a statement only and not as an
expression, because conflicts arise considering nesting and use in arrays:

    yield yield $a => $b;
    // could be either
    yield (yield $a) => $b;
    // or
    yield (yield $a => $b);

Once I find some way to resolve these conflicts this should be available
as an expression too.

Also the key yielding code is rather copy-and-past-y for the value yielding
code, so that should be factored out.

1 files changed, 2 insertions, 0 deletions

diff --git a/Zend/zend_generators.h b/Zend/zend_generators.h
index c9b43b31b6..2fd2c93b63 100644
--- a/Zend/zend_generators.h
+++ b/Zend/zend_generators.h
@@ -30,6 +30,8 @@ typedef struct _zend_generator {
 	zend_execute_data *execute_data;
 	/* Current value */
 	zval *value;
+	/* Current key */
+	zval *key;
 	/* Variable to put sent value into */
 	temp_variable *send_target;
 } zend_generator;