This code the illustrates the issue; it has no errors or warnings:
```php
class A {
function m(): parent {
return $this;
}
}
```
However, if you run the method you will get an error. I want to add a
light warning such as E_STRICT or E_DEPRECATED at compile time.
Using CG(active_class_entry)->parent will not work at compile time, so
that strategy is out.
Given that `zend_compile_func_decl` is not called directly from
`zend_compile_class_decl` it would be difficult to pass the parent's
name in any way other than a compiler global. Is there anything in
particular I need to do if I add another compiler global? I intend to
set and unset it in `zend_compile_class_decl`.
Anyone have a better way to pass around the parent's name at compile time?
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