include special overload without priority

Author: ktoso

stdlib/public/Concurrency/TaskGroup+addTask.swift.gyb

@@ -106,6 +106,21 @@ let __addTaskMustEnqueueJobOnCreate = true
 %          'operation: sending @escaping @isolated(any) () async throws -> ChildTaskResult'
 %        ],
 %      ),
+%      (
+%        'SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY',
+%        [
+%          'TaskGroup',
+%          'ThrowingTaskGroup',
+%        ],
+%        [
+%          '@available(SwiftStdlib 5.7, *)',
+%          '// version for task to thread model, without priority parameter',
+%        ],
+%        ['addTask', 'addTaskUnlessCancelled'],
+%        [
+%          'operation: sending @escaping @isolated(any) () async throws -> ChildTaskResult'
+%        ],
+%      ),
 % ]:
 %
 % for TYPE in TYPES:
@@ -121,7 +136,9 @@ let __addTaskMustEnqueueJobOnCreate = true
 % for METHOD_NAME in ADD_TASK_METHOD_VARIANT:
 %
 % IS_ADD_UNLESS_CANCELLED = METHOD_NAME == "addTaskUnlessCancelled"
+% IS_IMPL_UNAVAILABLE = any('Unavailable in task-to-thread' in av for av in ALL_AVAILABILITY)
 %
+% HAS_TASK_PRIORITY = any('priority:' in param for param in PARAMS)
 % HAS_TASK_NAME = any('name:' in param for param in PARAMS)
 % HAS_TASK_EXECUTOR = any('taskExecutor:' in param for param in PARAMS)
 %
@@ -156,7 +173,9 @@ extension ${TYPE} {
   % if HAS_TASK_EXECUTOR:
   ///   - taskExecutor: The task executor that the child task should be started on and keep using.
   % end
+  % if HAS_TASK_PRIORITY:
   ///   - priority: The priority of the operation task.
+  % end
   ///     Omit this parameter or pass `.unspecified`
   ///     to set the child task's priority to the priority of the group.
   ///   - operation: The operation to execute as part of the task group.
@@ -169,6 +188,9 @@ extension ${TYPE} {
   public mutating func ${METHOD_NAME}(
     ${",\n    ".join(PARAMS)}
   ) ${ARROW_RETURN_TYPE}{
+    % if IS_IMPL_UNAVAILABLE:
+    fatalError("Unavailable in task-to-thread concurrency model")
+    % else: # !IS_IMPL_UNAVAILABLE
     % if IS_ADD_UNLESS_CANCELLED:
     let canAdd = _taskGroupAddPendingTask(group: _group, unconditionally: false)
 
@@ -179,7 +201,7 @@ extension ${TYPE} {
     % end # IS_ADD_UNLESS_CANCELLED
 
     let flags = taskCreateFlags(
-      priority: priority,
+      priority: ${'priority' if HAS_TASK_PRIORITY else 'nil'},
       isChildTask: true,
       copyTaskLocals: false,
       inheritContext: false,
@@ -252,6 +274,7 @@ extension ${TYPE} {
     % if IS_ADD_UNLESS_CANCELLED:
     return true // task successfully enqueued
     % end
+    % end # !IS_IMPL_UNAVAILABLE
   }
 
 }