swift-mirror/test/NameBinding/protocol-inheritance.swift at bc76ac0f5045cc470202c3ac9400b67a1fc901b8 - swift-mirror - Gitea: Git with a cup of tea

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Slava Pestov 8541811edf AST: Fix ProtocolDecl::getInheritedProtocols() for protocols that inherit from compositions

We allow protocols to inherit from protocol compositions
defined via a typealias, eg,

typealias PQ = P & Q

protocol R : PQ {}

Sometimes, ProtocolDecl::getInheritedProtocols() is called before
the protocol's requirement signature has been computed. In this
case, we walk the inheritance clause of the protocol directly.
This walk was only looking at ProtocolType members of the
inheritance clause, ignoring ProtocolCompositionTypes.

As a result, name lookup could fail with an assertion because of
not being able to "see" members inherited via the protocol
composition.

Fixes <rdar://problem/32595988>.

2017-06-17 00:27:45 -07:00

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 // RUN: %target-swift-frontend -typecheck -primary-file %s %S/Inputs/protocol-inheritance.swift
 func kitty<Purrs>(cat: Meow<Purrs>) {
   cat.pet()
 }