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, 1 insertions, 1 deletions

diff --git a/Zend/zend_compile.h b/Zend/zend_compile.h
index 953a9f1df0..ec86ed86de 100644
--- a/Zend/zend_compile.h
+++ b/Zend/zend_compile.h
@@ -490,7 +490,7 @@ void zend_do_build_full_name(znode *result, znode *prefix, znode *name, int is_c
 int zend_do_begin_class_member_function_call(znode *class_name, znode *method_name TSRMLS_DC);
 void zend_do_end_function_call(znode *function_name, znode *result, const znode *argument_list, int is_method, int is_dynamic_fcall TSRMLS_DC);
 void zend_do_return(znode *expr, int do_end_vparse TSRMLS_DC);
-void zend_do_yield(znode *result, const znode *expr TSRMLS_DC);
+void zend_do_yield(znode *result, const znode *value, const znode *key TSRMLS_DC);
 void zend_do_suspend_if_generator(TSRMLS_D);
 void zend_do_handle_exception(TSRMLS_D);