simplify repro

Author: aaronsky

examples/apple/objc_interop/OIPrintStream.h

@@ -15,10 +15,12 @@
 #import <Foundation/Foundation.h>
 
 /** A very contrived interface for writing strings to a file handle. */
-@interface OIPrintStream : NSObject
+@interface OIPrintStream<PrintType> : NSObject
 
 - (nonnull instancetype)initWithFileHandle:(nonnull NSFileHandle *)fileHandle;
 
+- (void)print:(nonnull PrintType)message;
+
 - (void)printString:(nonnull NSString *)message;
 
 @end

examples/apple/objc_interop/OIPrintStream.m

@@ -25,6 +25,9 @@ - (instancetype)initWithFileHandle:(nonnull NSFileHandle *)fileHandle {
   return self;
 }
 
+- (void)print:(nonnull id)message {
+}
+
 - (void)printString:(nonnull NSString *)message {
   NSData *data = [message dataUsingEncoding:NSUTF8StringEncoding];
   [_fileHandle writeData:data];

examples/apple/objc_interop/Printer.swift

@@ -15,17 +15,24 @@
 import Foundation
 import examples_apple_objc_interop_PrintStream
 
+@objc public protocol MyStupid {
+}
+
 @objc(OIPrinter)
 public class Printer: NSObject {
 
-  private let stream: OIPrintStream
+  private let stream: OIPrintStream<MyStupid>
   private let prefix: String
 
   @objc public init(prefix: NSString) {
     self.stream = OIPrintStream(fileHandle: .standardOutput)
     self.prefix = prefix as String
   }
 
+  @objc public func stream(_ thing: MyStupid) -> OIPrintStream<MyStupid> {
+    return stream
+  }
+
   @objc public func print(_ message: NSString) {
     stream.print("\(prefix)\(message)")
   }

examples/apple/objc_interop_modulemap/OIPrintStream.h

@@ -14,9 +14,6 @@
 
 #import <Foundation/Foundation.h>
 
-@protocol Stupid
-@end
-
 /** A very contrived interface for writing strings to a file handle. */
 @interface OIPrintStream<PrintType> : NSObject