When a trait method declares `: self` as its return type, flattening
that method into a using class now substitutes the trait's QN with the
using class's QN in the return type. This fixes fluent chains like:
trait T { public function tap(): self { return $this; } }
class C { use T; public function ok(): int { return 1; } }
$c->tap()->ok(); // resolves through to C.ok now
Implementation:
- flatten_trait_into_class scans the source method's signature for
NAMED(trait_qn) in the return type and rewrites it to
NAMED(using_class_qn) when registering the flattened method.
- php_lsp_collect_class_fields now does TWO passes — pass 0 for
trait/interface declarators (so their declared-return-types get
re-parsed before any consumer), pass 1 for class/enum (which may
`use Trait;` and need the trait's signatures already up-to-date).
Total tests: 3013 / 0 failed (200 php_lsp).
Martin Vogel
d8646dae91