[Async Refactoring] Remove assertions for nil result values in async wrapper

Since we aren’t checking that all result arguments are `nil` if there was an `error` in all the other refactorings, also remove the assertions in the async wrapper.

Author: ahoppen

lib/IDE/Refactoring.cpp

@@ -6082,17 +6082,9 @@ class AsyncConverter : private SourceEntityWalker {
         OS << *ErrName << " " << tok::equal << " " << *ErrName << " ";
         OS << tok::l_brace << "\n";
         for (auto Idx : indices(SuccessParamNames)) {
-          auto &Name = SuccessParamNames[Idx];
           auto ParamTy = SuccessParams[Idx].getParameterType();
           if (!HandlerDesc.shouldUnwrap(ParamTy))
             continue;
-
-          // assert(res == nil, "Expected nil-success param 'res' for non-nil
-          //                     error")
-          OS << "assert" << tok::l_paren << Name << " == " << tok::kw_nil;
-          OS << tok::comma << " \"Expected nil success param '" << Name;
-          OS << "' for non-nil error\"";
-          OS << tok::r_paren << "\n";
         }
 
         // continuation.resume(throwing: err)

test/refactoring/ConvertAsync/convert_async_wrapper.swift

@@ -85,7 +85,6 @@ func foo6(_ completion: @escaping (String?, Error?) -> Void) {}
 // FOO6-NEXT:   return try await withCheckedThrowingContinuation { continuation in
 // FOO6-NEXT:     foo6() { result, error in
 // FOO6-NEXT:       if let error = error {
-// FOO6-NEXT:         assert(result == nil, "Expected nil success param 'result' for non-nil error")
 // FOO6-NEXT:         continuation.resume(throwing: error)
 // FOO6-NEXT:         return
 // FOO6-NEXT:       }
@@ -104,7 +103,6 @@ func foo7(_ completion: @escaping (String?, Int, Error?) -> Void) {}
 // FOO7-NEXT:   return try await withCheckedThrowingContinuation { continuation in
 // FOO7-NEXT:     foo7() { result1, result2, error in
 // FOO7-NEXT:       if let error = error {
-// FOO7-NEXT:         assert(result1 == nil, "Expected nil success param 'result1' for non-nil error")
 // FOO7-NEXT:         continuation.resume(throwing: error)
 // FOO7-NEXT:         return
 // FOO7-NEXT:       }
@@ -123,8 +121,6 @@ func foo8(_ completion: @escaping (String?, Int?, Error?) -> Void) {}
 // FOO8-NEXT:   return try await withCheckedThrowingContinuation { continuation in
 // FOO8-NEXT:     foo8() { result1, result2, error in
 // FOO8-NEXT:       if let error = error {
-// FOO8-NEXT:         assert(result1 == nil, "Expected nil success param 'result1' for non-nil error")
-// FOO8-NEXT:         assert(result2 == nil, "Expected nil success param 'result2' for non-nil error")
 // FOO8-NEXT:         continuation.resume(throwing: error)
 // FOO8-NEXT:         return
 // FOO8-NEXT:       }