[Test] NFC: Add test-case for recursive protocol deserialization (rdar://100127674)

Author: xedin

test/Serialization/test_recursive_protocol_deserialization.swift

@@ -0,0 +1,41 @@
+// RUN: %empty-directory(%t/src)
+// RUN: split-file %s %t/src
+
+/// Build the library A
+// RUN: %target-swift-frontend -emit-module %t/src/API.swift \
+// RUN:   -module-name API -swift-version 5 \
+// RUN:   -emit-module-path %t/API.swiftmodule
+
+// Build client with module
+// RUN: %target-swift-emit-silgen \
+// RUN:   -I %t \
+// RUN:   -module-name Client \
+// RUN:    %t/src/Client.swift -verify
+
+//--- API.swift
+
+public class C {}
+
+public protocol P1 {
+  typealias A = (C & P1)
+}
+
+public protocol P2 {
+  typealias F = (P2) -> Void
+}
+
+public protocol P3 where Self : C {
+}
+
+//--- Client.swift
+import API
+
+func test(_: any P1) {} // Ok
+
+_ = P2.self // Ok
+
+class B : P3 {
+  // expected-error@-1 {{type 'B' does not conform to protocol 'P3'}}
+  // expected-error@-2 {{'P3' requires that 'B' inherit from 'C'}}
+  // expected-note@-3 {{requirement specified as 'Self' : 'C' [with Self = B]}}
+}