diff --git a/Objects/abstract.c b/Objects/abstract.c
index 9e9c9aaa0e6..cec47bf774a 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -32,8 +32,10 @@ PyObject_Type(PyObject *o)
 {
     PyObject *v;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     v = (PyObject *)o->ob_type;
     Py_INCREF(v);
     return v;
@@ -137,8 +139,9 @@ PyObject_GetItem(PyObject *o, PyObject *key)
 {
     PyMappingMethods *m;
 
-    if (o == NULL || key == NULL)
+    if (o == NULL || key == NULL) {
         return null_error();
+    }
 
     m = o->ob_type->tp_as_mapping;
     if (m && m->mp_subscript) {
@@ -1125,8 +1128,10 @@ PyNumber_Negative(PyObject *o)
 {
     PyNumberMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     m = o->ob_type->tp_as_number;
     if (m && m->nb_negative)
         return (*m->nb_negative)(o);
@@ -1139,8 +1144,10 @@ PyNumber_Positive(PyObject *o)
 {
     PyNumberMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     m = o->ob_type->tp_as_number;
     if (m && m->nb_positive)
         return (*m->nb_positive)(o);
@@ -1153,8 +1160,10 @@ PyNumber_Invert(PyObject *o)
 {
     PyNumberMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     m = o->ob_type->tp_as_number;
     if (m && m->nb_invert)
         return (*m->nb_invert)(o);
@@ -1167,8 +1176,10 @@ PyNumber_Absolute(PyObject *o)
 {
     PyNumberMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     m = o->ob_type->tp_as_number;
     if (m && m->nb_absolute)
         return m->nb_absolute(o);
@@ -1184,8 +1195,10 @@ PyObject *
 PyNumber_Index(PyObject *item)
 {
     PyObject *result = NULL;
-    if (item == NULL)
+    if (item == NULL) {
         return null_error();
+    }
+
     if (PyLong_Check(item)) {
         Py_INCREF(item);
         return item;
@@ -1273,8 +1286,10 @@ PyNumber_Long(PyObject *o)
     Py_buffer view;
     _Py_IDENTIFIER(__trunc__);
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     if (PyLong_CheckExact(o)) {
         Py_INCREF(o);
         return o;
@@ -1349,8 +1364,10 @@ PyNumber_Float(PyObject *o)
 {
     PyNumberMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
+
     if (PyFloat_CheckExact(o)) {
         Py_INCREF(o);
         return o;
@@ -1451,8 +1468,9 @@ PySequence_Concat(PyObject *s, PyObject *o)
 {
     PySequenceMethods *m;
 
-    if (s == NULL || o == NULL)
+    if (s == NULL || o == NULL) {
         return null_error();
+    }
 
     m = s->ob_type->tp_as_sequence;
     if (m && m->sq_concat)
@@ -1475,8 +1493,9 @@ PySequence_Repeat(PyObject *o, Py_ssize_t count)
 {
     PySequenceMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
 
     m = o->ob_type->tp_as_sequence;
     if (m && m->sq_repeat)
@@ -1504,8 +1523,9 @@ PySequence_InPlaceConcat(PyObject *s, PyObject *o)
 {
     PySequenceMethods *m;
 
-    if (s == NULL || o == NULL)
+    if (s == NULL || o == NULL) {
         return null_error();
+    }
 
     m = s->ob_type->tp_as_sequence;
     if (m && m->sq_inplace_concat)
@@ -1528,8 +1548,9 @@ PySequence_InPlaceRepeat(PyObject *o, Py_ssize_t count)
 {
     PySequenceMethods *m;
 
-    if (o == NULL)
+    if (o == NULL) {
         return null_error();
+    }
 
     m = o->ob_type->tp_as_sequence;
     if (m && m->sq_inplace_repeat)
@@ -1557,8 +1578,9 @@ PySequence_GetItem(PyObject *s, Py_ssize_t i)
 {
     PySequenceMethods *m;
 
-    if (s == NULL)
+    if (s == NULL) {
         return null_error();
+    }
 
     m = s->ob_type->tp_as_sequence;
     if (m && m->sq_item) {
@@ -1583,7 +1605,9 @@ PySequence_GetSlice(PyObject *s, Py_ssize_t i1, Py_ssize_t i2)
 {
     PyMappingMethods *mp;
 
-    if (!s) return null_error();
+    if (!s) {
+        return null_error();
+    }
 
     mp = s->ob_type->tp_as_mapping;
     if (mp && mp->mp_subscript) {
@@ -1710,8 +1734,9 @@ PySequence_Tuple(PyObject *v)
     PyObject *result = NULL;
     Py_ssize_t j;
 
-    if (v == NULL)
+    if (v == NULL) {
         return null_error();
+    }
 
     /* Special-case the common tuple and list cases, for efficiency. */
     if (PyTuple_CheckExact(v)) {
@@ -1791,8 +1816,9 @@ PySequence_List(PyObject *v)
     PyObject *result;  /* result list */
     PyObject *rv;          /* return value from PyList_Extend */
 
-    if (v == NULL)
+    if (v == NULL) {
         return null_error();
+    }
 
     result = PyList_New(0);
     if (result == NULL)
@@ -1812,8 +1838,9 @@ PySequence_Fast(PyObject *v, const char *m)
 {
     PyObject *it;
 
-    if (v == NULL)
+    if (v == NULL) {
         return null_error();
+    }
 
     if (PyList_CheckExact(v) || PyTuple_CheckExact(v)) {
         Py_INCREF(v);
@@ -1996,8 +2023,9 @@ PyMapping_GetItemString(PyObject *o, const char *key)
 {
     PyObject *okey, *r;
 
-    if (key == NULL)
+    if (key == NULL) {
         return null_error();
+    }
 
     okey = PyUnicode_FromString(key);
     if (okey == NULL)
@@ -2292,8 +2320,9 @@ PyObject_CallFunction(PyObject *callable, const char *format, ...)
     va_list va;
     PyObject *args, *result;
 
-    if (callable == NULL)
+    if (callable == NULL) {
         return null_error();
+    }
 
     if (format && *format) {
         va_start(va, format);
@@ -2318,8 +2347,9 @@ _PyObject_CallFunction_SizeT(PyObject *callable, const char *format, ...)
     va_list va;
     PyObject *args, *result;
 
-    if (callable == NULL)
+    if (callable == NULL) {
         return null_error();
+    }
 
     if (format && *format) {
         va_start(va, format);
@@ -2375,8 +2405,9 @@ PyObject_CallMethod(PyObject *o, const char *name, const char *format, ...)
     PyObject *func = NULL;
     PyObject *retval = NULL;
 
-    if (o == NULL || name == NULL)
+    if (o == NULL || name == NULL) {
         return null_error();
+    }
 
     func = PyObject_GetAttrString(o, name);
     if (func == NULL)
@@ -2397,8 +2428,9 @@ _PyObject_CallMethodId(PyObject *o, _Py_Identifier *name,
     PyObject *func = NULL;
     PyObject *retval = NULL;
 
-    if (o == NULL || name == NULL)
+    if (o == NULL || name == NULL) {
         return null_error();
+    }
 
     func = _PyObject_GetAttrId(o, name);
     if (func == NULL)
@@ -2419,8 +2451,9 @@ _PyObject_CallMethod_SizeT(PyObject *o, const char *name,
     PyObject *func = NULL;
     PyObject *retval;
 
-    if (o == NULL || name == NULL)
+    if (o == NULL || name == NULL) {
         return null_error();
+    }
 
     func = PyObject_GetAttrString(o, name);
     if (func == NULL)
@@ -2440,8 +2473,9 @@ _PyObject_CallMethodId_SizeT(PyObject *o, _Py_Identifier *name,
     PyObject *func = NULL;
     PyObject *retval;
 
-    if (o == NULL || name == NULL)
+    if (o == NULL || name == NULL) {
         return null_error();
+    }
 
     func = _PyObject_GetAttrId(o, name);
     if (func == NULL) {
@@ -2482,8 +2516,9 @@ PyObject_CallMethodObjArgs(PyObject *callable, PyObject *name, ...)
     PyObject *args, *tmp;
     va_list vargs;
 
-    if (callable == NULL || name == NULL)
+    if (callable == NULL || name == NULL) {
         return null_error();
+    }
 
     callable = PyObject_GetAttr(callable, name);
     if (callable == NULL)
@@ -2511,8 +2546,9 @@ _PyObject_CallMethodIdObjArgs(PyObject *callable,
     PyObject *args, *tmp;
     va_list vargs;
 
-    if (callable == NULL || name == NULL)
+    if (callable == NULL || name == NULL) {
         return null_error();
+    }
 
     callable = _PyObject_GetAttrId(callable, name);
     if (callable == NULL)
@@ -2539,8 +2575,9 @@ PyObject_CallFunctionObjArgs(PyObject *callable, ...)
     PyObject *args, *tmp;
     va_list vargs;
 
-    if (callable == NULL)
+    if (callable == NULL) {
         return null_error();
+    }
 
     /* count the args */
     va_start(vargs, callable);