Example: Foo(...) -> (...) Async WantsConnection ...results in this generated code: IPC::handleMessageAsync<Messages::WebPageProxy::Foo>(connection, connection, decoder, this, &WebPageProxy::foo); ...which results in a compiler error due to the duplicated `connection` argument.
Created attachment 400074 [details] Patch
Committed r262075: <https://trac.webkit.org/changeset/262075> All reviewed patches have been landed. Closing bug and clearing flags on attachment 400074 [details].
<rdar://problem/63554831>