bpo-34762: Update PyContext* to PyObject* in asyncio and decimal (GH-9609)

This fixes various compiler warnings.

Author: 1st1

Modules/_asynciomodule.c

@@ -61,7 +61,7 @@ typedef enum {
  PyObject_HEAD \
  PyObject *prefix##_loop; \
  PyObject *prefix##_callback0; \
- PyContext *prefix##_context0; \
+ PyObject *prefix##_context0;  \
  PyObject *prefix##_callbacks; \
  PyObject *prefix##_exception; \
  PyObject *prefix##_result; \
@@ -81,7 +81,7 @@ typedef struct {
  PyObject *task_fut_waiter;
  PyObject *task_coro;
  PyObject *task_name;
- PyContext *task_context;
+ PyObject *task_context;
  int task_must_cancel;
  int task_log_destroy_pending;
 } TaskObj;
@@ -340,7 +340,7 @@ get_event_loop(void)
 
 
 static int
-call_soon(PyObject *loop, PyObject *func, PyObject *arg, PyContext *ctx)
+call_soon(PyObject *loop, PyObject *func, PyObject *arg, PyObject *ctx)
 {
  PyObject *handle;
  PyObject *stack[3];
@@ -451,7 +451,7 @@ future_schedule_callbacks(FutureObj *fut)
  PyObject *cb = PyTuple_GET_ITEM(cb_tup, 0);
  PyObject *ctx = PyTuple_GET_ITEM(cb_tup, 1);
 
- if (call_soon(fut->fut_loop, cb, (PyObject *)fut, (PyContext *)ctx)) {
+ if (call_soon(fut->fut_loop, cb, (PyObject *)fut, ctx)) {
  /* If an error occurs in pure-Python implementation,
  all callbacks are cleared. */
  Py_CLEAR(fut->fut_callbacks);
@@ -619,7 +619,7 @@ future_get_result(FutureObj *fut, PyObject **result)
 }
 
 static PyObject *
-future_add_done_callback(FutureObj *fut, PyObject *arg, PyContext *ctx)
+future_add_done_callback(FutureObj *fut, PyObject *arg, PyObject *ctx)
 {
  if (!future_is_alive(fut)) {
  PyErr_SetString(PyExc_RuntimeError, "uninitialized Future object");
@@ -906,16 +906,15 @@ _asyncio_Future_add_done_callback_impl(FutureObj *self, PyObject *fn,
 /*[clinic end generated code: output=7ce635bbc9554c1e input=15ab0693a96e9533]*/
 {
  if (context == NULL) {
- context = (PyObject *)PyContext_CopyCurrent();
+ context = PyContext_CopyCurrent();
  if (context == NULL) {
  return NULL;
  }
- PyObject *res = future_add_done_callback(
- self, fn, (PyContext *)context);
+ PyObject *res = future_add_done_callback(self, fn, context);
  Py_DECREF(context);
  return res;
  }
- return future_add_done_callback(self, fn, (PyContext *)context);
+ return future_add_done_callback(self, fn, context);
 }
 
 /*[clinic input]

Modules/_decimal/_decimal.c

@@ -122,7 +122,7 @@ incr_false(void)
 }
 
 
-static PyContextVar *current_context_var;
+static PyObject *current_context_var;
 
 /* Template for creating new thread contexts, calling Context() without
  * arguments and initializing the module_context on first access. */
@@ -1500,7 +1500,7 @@ init_current_context(void)
  }
  CTX(tl_context)->status = 0;
 
- PyContextToken *tok = PyContextVar_Set(current_context_var, tl_context);
+ PyObject *tok = PyContextVar_Set(current_context_var, tl_context);
  if (tok == NULL) {
  Py_DECREF(tl_context);
  return NULL;
@@ -1561,7 +1561,7 @@ PyDec_SetCurrentContext(PyObject *self UNUSED, PyObject *v)
  Py_INCREF(v);
  }
 
- PyContextToken *tok = PyContextVar_Set(current_context_var, v);
+ PyObject *tok = PyContextVar_Set(current_context_var, v);
  Py_DECREF(v);
  if (tok == NULL) {
  return NULL;