diff --git a/py/argcheck.c b/py/argcheck.c
index 8cef10b..9f22534 100644
--- a/py/argcheck.c
+++ b/py/argcheck.c
@@ -37,7 +37,7 @@
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
             mp_arg_error_terse_mismatch();
         } else {
-            mp_raise_msg(&mp_type_TypeError, "function does not take keyword arguments");
+            mp_raise_TypeError("function does not take keyword arguments");
         }
     }
 
@@ -115,7 +115,7 @@
             mp_arg_error_terse_mismatch();
         } else {
             // TODO better error message
-            mp_raise_msg(&mp_type_TypeError, "extra positional arguments given");
+            mp_raise_TypeError("extra positional arguments given");
         }
     }
     if (kws_found < kws->used) {
@@ -123,7 +123,7 @@
             mp_arg_error_terse_mismatch();
         } else {
             // TODO better error message
-            mp_raise_msg(&mp_type_TypeError, "extra keyword arguments given");
+            mp_raise_TypeError("extra keyword arguments given");
         }
     }
 }
@@ -136,7 +136,7 @@
 
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE || _MSC_VER
 NORETURN void mp_arg_error_terse_mismatch(void) {
-    mp_raise_msg(&mp_type_TypeError, "argument num/types mismatch");
+    mp_raise_TypeError("argument num/types mismatch");
 }
 #endif
 
diff --git a/py/bc.c b/py/bc.c
index 1288764..4c0eb53 100644
--- a/py/bc.c
+++ b/py/bc.c
@@ -197,7 +197,7 @@
             // Didn't find name match with positional args
             if ((scope_flags & MP_SCOPE_FLAG_VARKEYWORDS) == 0) {
                 if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-                    mp_raise_msg(&mp_type_TypeError, "unexpected keyword argument");
+                    mp_raise_TypeError("unexpected keyword argument");
                 } else {
                     nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                         "unexpected keyword argument '%q'", MP_OBJ_QSTR_VALUE(wanted_arg_name)));
@@ -250,7 +250,7 @@
     } else {
         // no keyword arguments given
         if (n_kwonly_args != 0) {
-            mp_raise_msg(&mp_type_TypeError, "function missing keyword-only argument");
+            mp_raise_TypeError("function missing keyword-only argument");
         }
         if ((scope_flags & MP_SCOPE_FLAG_VARKEYWORDS) != 0) {
             *var_pos_kw_args = mp_obj_new_dict(0);
diff --git a/py/builtinevex.c b/py/builtinevex.c
index b0514ee..89fcc2f 100644
--- a/py/builtinevex.c
+++ b/py/builtinevex.c
@@ -95,7 +95,7 @@
         case MP_QSTR_exec: parse_input_kind = MP_PARSE_FILE_INPUT; break;
         case MP_QSTR_eval: parse_input_kind = MP_PARSE_EVAL_INPUT; break;
         default:
-            mp_raise_msg(&mp_type_ValueError, "bad compile mode");
+            mp_raise_ValueError("bad compile mode");
     }
 
     mp_obj_code_t *code = m_new_obj(mp_obj_code_t);
diff --git a/py/builtinimport.c b/py/builtinimport.c
index 96846b9..17c1622 100644
--- a/py/builtinimport.c
+++ b/py/builtinimport.c
@@ -341,7 +341,7 @@
         qstr new_mod_q = qstr_from_strn(new_mod, new_mod_l);
         DEBUG_printf("Resolved base name for relative import: '%s'\n", qstr_str(new_mod_q));
         if (new_mod_q == MP_QSTR_) {
-            mp_raise_msg(&mp_type_ValueError, "cannot perform relative import");
+            mp_raise_ValueError("cannot perform relative import");
         }
         module_name = MP_OBJ_NEW_QSTR(new_mod_q);
         mod_str = new_mod;
diff --git a/py/modbuiltins.c b/py/modbuiltins.c
index bd32501..f1d703a 100644
--- a/py/modbuiltins.c
+++ b/py/modbuiltins.c
@@ -180,7 +180,7 @@
         str[3] = (c & 0x3F) | 0x80;
         len = 4;
     } else {
-        mp_raise_msg(&mp_type_ValueError, "chr() arg not in range(0x110000)");
+        mp_raise_ValueError("chr() arg not in range(0x110000)");
     }
     return mp_obj_new_str(str, len, true);
     #else
@@ -189,7 +189,7 @@
         char str[1] = {ord};
         return mp_obj_new_str(str, 1, true);
     } else {
-        mp_raise_msg(&mp_type_ValueError, "chr() arg not in range(256)");
+        mp_raise_ValueError("chr() arg not in range(256)");
     }
     #endif
 }
@@ -289,7 +289,7 @@
             if (default_elem != NULL) {
                 best_obj = default_elem->value;
             } else {
-                mp_raise_msg(&mp_type_ValueError, "arg is an empty sequence");
+                mp_raise_ValueError("arg is an empty sequence");
             }
         }
         return best_obj;
@@ -504,7 +504,7 @@
 
 STATIC mp_obj_t mp_builtin_sorted(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
     if (n_args > 1) {
-        mp_raise_msg(&mp_type_TypeError, "must use keyword argument for key function");
+        mp_raise_TypeError("must use keyword argument for key function");
     }
     mp_obj_t self = mp_type_list.make_new(&mp_type_list, 1, 0, args);
     mp_obj_list_sort(1, &self, kwargs);
diff --git a/py/modthread.c b/py/modthread.c
index dda9e93..ecf4705 100644
--- a/py/modthread.c
+++ b/py/modthread.c
@@ -227,7 +227,7 @@
     } else {
         // positional and keyword arguments
         if (mp_obj_get_type(args[2]) != &mp_type_dict) {
-            mp_raise_msg(&mp_type_TypeError, "expecting a dict for keyword args");
+            mp_raise_TypeError("expecting a dict for keyword args");
         }
         mp_map_t *map = &((mp_obj_dict_t*)MP_OBJ_TO_PTR(args[2]))->map;
         th_args = m_new_obj_var(thread_entry_args_t, mp_obj_t, pos_args_len + 2 * map->used);
diff --git a/py/obj.c b/py/obj.c
index c065a3b..4b5fe25 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -229,7 +229,7 @@
         return mp_obj_int_get_checked(arg);
     } else {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "can't convert to int");
+            mp_raise_TypeError("can't convert to int");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "can't convert %s to int", mp_obj_get_type_str(arg)));
@@ -279,7 +279,7 @@
         return mp_obj_float_get(arg);
     } else {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "can't convert to float");
+            mp_raise_TypeError("can't convert to float");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "can't convert %s to float", mp_obj_get_type_str(arg)));
@@ -310,7 +310,7 @@
         mp_obj_complex_get(arg, real, imag);
     } else {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "can't convert to complex");
+            mp_raise_TypeError("can't convert to complex");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "can't convert %s to complex", mp_obj_get_type_str(arg)));
@@ -328,7 +328,7 @@
         mp_obj_list_get(o, len, items);
     } else {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "expected tuple/list");
+            mp_raise_TypeError("expected tuple/list");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "object '%s' is not a tuple or list", mp_obj_get_type_str(o)));
@@ -342,7 +342,7 @@
     mp_obj_get_array(o, &seq_len, items);
     if (seq_len != len) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_ValueError, "tuple/list has wrong length");
+            mp_raise_ValueError("tuple/list has wrong length");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
                 "requested length %d but object has length %d", (int)len, (int)seq_len));
@@ -357,7 +357,7 @@
         i = MP_OBJ_SMALL_INT_VALUE(index);
     } else if (!mp_obj_get_int_maybe(index, &i)) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "indices must be integers");
+            mp_raise_TypeError("indices must be integers");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "%q indices must be integers, not %s",
@@ -412,7 +412,7 @@
     mp_obj_t len = mp_obj_len_maybe(o_in);
     if (len == MP_OBJ_NULL) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "object has no len");
+            mp_raise_TypeError("object has no len");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "object of type '%s' has no len()", mp_obj_get_type_str(o_in)));
@@ -453,7 +453,7 @@
     }
     if (value == MP_OBJ_NULL) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "object does not support item deletion");
+            mp_raise_TypeError("object does not support item deletion");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "'%s' object does not support item deletion", mp_obj_get_type_str(base)));
@@ -468,7 +468,7 @@
         }
     } else {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "object does not support item assignment");
+            mp_raise_TypeError("object does not support item assignment");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "'%s' object does not support item assignment", mp_obj_get_type_str(base)));
@@ -502,7 +502,7 @@
 
 void mp_get_buffer_raise(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
     if (!mp_get_buffer(obj, bufinfo, flags)) {
-        mp_raise_msg(&mp_type_TypeError, "object with buffer protocol required");
+        mp_raise_TypeError("object with buffer protocol required");
     }
 }
 
diff --git a/py/objarray.c b/py/objarray.c
index 05d28c8..21479a8 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -391,7 +391,7 @@
                     mp_obj_array_t *src_slice = MP_OBJ_TO_PTR(value);
                     if (item_sz != mp_binary_get_size('@', src_slice->typecode & TYPECODE_MASK, NULL)) {
                     compat_error:
-                        mp_raise_msg(&mp_type_ValueError, "lhs and rhs should be compatible");
+                        mp_raise_ValueError("lhs and rhs should be compatible");
                     }
                     src_len = src_slice->len;
                     src_items = src_slice->items;
diff --git a/py/objdict.c b/py/objdict.c
index 013cc0a..5f84d71 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -386,7 +386,7 @@
                 if (key == MP_OBJ_STOP_ITERATION
                     || value == MP_OBJ_STOP_ITERATION
                     || stop != MP_OBJ_STOP_ITERATION) {
-                    mp_raise_msg(&mp_type_ValueError, "dictionary update sequence has the wrong length");
+                    mp_raise_ValueError("dictionary update sequence has the wrong length");
                 } else {
                     mp_map_lookup(&self->map, key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
                 }
diff --git a/py/objgenerator.c b/py/objgenerator.c
index e59ff3a..2e57fdf 100644
--- a/py/objgenerator.c
+++ b/py/objgenerator.c
@@ -105,7 +105,7 @@
     }
     if (self->code_state.sp == self->code_state.state - 1) {
         if (send_value != mp_const_none) {
-            mp_raise_msg(&mp_type_TypeError, "can't send non-None value to a just-started generator");
+            mp_raise_TypeError("can't send non-None value to a just-started generator");
         }
     } else {
         *self->code_state.sp = send_value;
diff --git a/py/objint_mpz.c b/py/objint_mpz.c
index 2cdf225..ca989e8 100644
--- a/py/objint_mpz.c
+++ b/py/objint_mpz.c
@@ -277,7 +277,7 @@
             case MP_BINARY_OP_INPLACE_RSHIFT: {
                 mp_int_t irhs = mp_obj_int_get_checked(rhs_in);
                 if (irhs < 0) {
-                    mp_raise_msg(&mp_type_ValueError, "negative shift count");
+                    mp_raise_ValueError("negative shift count");
                 }
                 if (op == MP_BINARY_OP_LSHIFT || op == MP_BINARY_OP_INPLACE_LSHIFT) {
                     mpz_shl_inpl(&res->mpz, zlhs, irhs);
diff --git a/py/objobject.c b/py/objobject.c
index b33dc49..f9a7d17 100644
--- a/py/objobject.c
+++ b/py/objobject.c
@@ -50,7 +50,7 @@
 
 STATIC mp_obj_t object___new__(mp_obj_t cls) {
     if (!MP_OBJ_IS_TYPE(cls, &mp_type_type) || !mp_obj_is_instance_type((mp_obj_type_t*)MP_OBJ_TO_PTR(cls))) {
-        mp_raise_msg(&mp_type_TypeError, "__new__ arg must be a user-type");
+        mp_raise_TypeError("__new__ arg must be a user-type");
     }
     mp_obj_t o = MP_OBJ_SENTINEL;
     mp_obj_t res = mp_obj_instance_make_new(MP_OBJ_TO_PTR(cls), 1, 0, &o);
diff --git a/py/objstringio.c b/py/objstringio.c
index 61a3075..88659de 100644
--- a/py/objstringio.c
+++ b/py/objstringio.c
@@ -39,7 +39,7 @@
 #if MICROPY_CPYTHON_COMPAT
 STATIC void check_stringio_is_open(const mp_obj_stringio_t *o) {
     if (o->vstr == NULL) {
-        mp_raise_msg(&mp_type_ValueError, "I/O operation on closed file");
+        mp_raise_ValueError("I/O operation on closed file");
     }
 }
 #else
diff --git a/py/objtype.c b/py/objtype.c
index a747a34..a64832c 100644
--- a/py/objtype.c
+++ b/py/objtype.c
@@ -311,7 +311,7 @@
         }
         if (init_ret != mp_const_none) {
             if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-                mp_raise_msg(&mp_type_TypeError, "__init__() should return None");
+                mp_raise_TypeError("__init__() should return None");
             } else {
                 nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                     "__init__() should return None, not '%s'", mp_obj_get_type_str(init_ret)));
@@ -744,7 +744,7 @@
     mp_obj_t call = mp_obj_instance_get_call(self_in, member);
     if (call == MP_OBJ_NULL) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "object not callable");
+            mp_raise_TypeError("object not callable");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "'%s' object is not callable", mp_obj_get_type_str(self_in)));
@@ -826,7 +826,7 @@
             return mp_obj_new_type(mp_obj_str_get_qstr(args[0]), args[1], args[2]);
 
         default:
-            mp_raise_msg(&mp_type_TypeError, "type takes 1 or 3 arguments");
+            mp_raise_TypeError("type takes 1 or 3 arguments");
     }
 }
 
@@ -837,7 +837,7 @@
 
     if (self->make_new == NULL) {
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "cannot create instance");
+            mp_raise_TypeError("cannot create instance");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "cannot create '%q' instances", self->name));
@@ -925,7 +925,7 @@
         // TODO: Verify with CPy, tested on function type
         if (t->make_new == NULL) {
             if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-                mp_raise_msg(&mp_type_TypeError, "type is not an acceptable base type");
+                mp_raise_TypeError("type is not an acceptable base type");
             } else {
                 nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                     "type '%q' is not an acceptable base type", t->name));
@@ -959,7 +959,7 @@
     const mp_obj_type_t *native_base;
     size_t num_native_bases = instance_count_native_bases(o, &native_base);
     if (num_native_bases > 1) {
-        mp_raise_msg(&mp_type_TypeError, "multiple bases have instance lay-out conflict");
+        mp_raise_TypeError("multiple bases have instance lay-out conflict");
     }
 
     mp_map_t *locals_map = &o->locals_dict->map;
@@ -1106,7 +1106,7 @@
     } else if (MP_OBJ_IS_TYPE(classinfo, &mp_type_tuple)) {
         mp_obj_tuple_get(classinfo, &len, &items);
     } else {
-        mp_raise_msg(&mp_type_TypeError, "issubclass() arg 2 must be a class or a tuple of classes");
+        mp_raise_TypeError("issubclass() arg 2 must be a class or a tuple of classes");
     }
 
     for (size_t i = 0; i < len; i++) {
@@ -1120,7 +1120,7 @@
 
 STATIC mp_obj_t mp_builtin_issubclass(mp_obj_t object, mp_obj_t classinfo) {
     if (!MP_OBJ_IS_TYPE(object, &mp_type_type)) {
-        mp_raise_msg(&mp_type_TypeError, "issubclass() arg 1 must be a class");
+        mp_raise_TypeError("issubclass() arg 1 must be a class");
     }
     return mp_obj_is_subclass(object, classinfo);
 }
diff --git a/py/parsenum.c b/py/parsenum.c
index 2e41801..1771188 100644
--- a/py/parsenum.c
+++ b/py/parsenum.c
@@ -55,7 +55,7 @@
     // check radix base
     if ((base != 0 && base < 2) || base > 36) {
         // this won't be reached if lex!=NULL
-        mp_raise_msg(&mp_type_ValueError, "int() arg 2 must be >= 2 and <= 36");
+        mp_raise_ValueError("int() arg 2 must be >= 2 and <= 36");
     }
 
     // skip leading space
diff --git a/py/runtime.c b/py/runtime.c
index 13dffc4..9f6c654 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -252,7 +252,7 @@
             }
         }
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "unsupported type for operator");
+            mp_raise_TypeError("unsupported type for operator");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "unsupported type for %q: '%s'",
@@ -344,7 +344,7 @@
                 case MP_BINARY_OP_INPLACE_LSHIFT: {
                     if (rhs_val < 0) {
                         // negative shift not allowed
-                        mp_raise_msg(&mp_type_ValueError, "negative shift count");
+                        mp_raise_ValueError("negative shift count");
                     } else if (rhs_val >= (mp_int_t)BITS_PER_WORD || lhs_val > (MP_SMALL_INT_MAX >> rhs_val) || lhs_val < (MP_SMALL_INT_MIN >> rhs_val)) {
                         // left-shift will overflow, so use higher precision integer
                         lhs = mp_obj_new_int_from_ll(lhs_val);
@@ -359,7 +359,7 @@
                 case MP_BINARY_OP_INPLACE_RSHIFT:
                     if (rhs_val < 0) {
                         // negative shift not allowed
-                        mp_raise_msg(&mp_type_ValueError, "negative shift count");
+                        mp_raise_ValueError("negative shift count");
                     } else {
                         // standard precision is enough for right-shift
                         if (rhs_val >= (mp_int_t)BITS_PER_WORD) {
@@ -435,7 +435,7 @@
                         lhs = mp_obj_new_float(lhs_val);
                         goto generic_binary_op;
                         #else
-                        mp_raise_msg(&mp_type_ValueError, "negative power with no float support");
+                        mp_raise_ValueError("negative power with no float support");
                         #endif
                     } else {
                         mp_int_t ans = 1;
@@ -537,7 +537,7 @@
         }
 
         if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-            mp_raise_msg(&mp_type_TypeError, "object not iterable");
+            mp_raise_TypeError("object not iterable");
         } else {
             nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                 "'%s' object is not iterable", mp_obj_get_type_str(rhs)));
@@ -559,7 +559,7 @@
 
 unsupported_op:
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_TypeError, "unsupported type for operator");
+        mp_raise_TypeError("unsupported type for operator");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
             "unsupported types for %q: '%s', '%s'",
@@ -601,7 +601,7 @@
     }
 
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_TypeError, "object not callable");
+        mp_raise_TypeError("object not callable");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
             "'%s' object is not callable", mp_obj_get_type_str(fun_in)));
@@ -830,14 +830,14 @@
 
 too_short:
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_ValueError, "wrong number of values to unpack");
+        mp_raise_ValueError("wrong number of values to unpack");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
             "need more than %d values to unpack", (int)seq_len));
     }
 too_long:
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_ValueError, "wrong number of values to unpack");
+        mp_raise_ValueError("wrong number of values to unpack");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
             "too many values to unpack (expected %d)", (int)num));
@@ -894,7 +894,7 @@
 
 too_short:
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_ValueError, "wrong number of values to unpack");
+        mp_raise_ValueError("wrong number of values to unpack");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
             "need more than %d values to unpack", (int)seq_len));
@@ -933,7 +933,7 @@
         const mp_obj_type_t *arg0_type = mp_obj_get_type(args[0]);
         if (arg0_type != self->type) {
             if (MICROPY_ERROR_REPORTING != MICROPY_ERROR_REPORTING_DETAILED) {
-                mp_raise_msg(&mp_type_TypeError, "argument has wrong type");
+                mp_raise_TypeError("argument has wrong type");
             } else {
                 nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                     "argument should be a '%q' not a '%q'", self->type->name, arg0_type->name));
@@ -1124,7 +1124,7 @@
 
     // object not iterable
     if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-        mp_raise_msg(&mp_type_TypeError, "object not iterable");
+        mp_raise_TypeError("object not iterable");
     } else {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
             "'%s' object is not iterable", mp_obj_get_type_str(o_in)));
@@ -1146,7 +1146,7 @@
             return mp_call_method_n_kw(0, 0, dest);
         } else {
             if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-                mp_raise_msg(&mp_type_TypeError, "object not an iterator");
+                mp_raise_TypeError("object not an iterator");
             } else {
                 nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                     "'%s' object is not an iterator", mp_obj_get_type_str(o_in)));
@@ -1182,7 +1182,7 @@
             }
         } else {
             if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
-                mp_raise_msg(&mp_type_TypeError, "object not an iterator");
+                mp_raise_TypeError("object not an iterator");
             } else {
                 nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
                     "'%s' object is not an iterator", mp_obj_get_type_str(o_in)));
diff --git a/py/sequence.c b/py/sequence.c
index 11761f6..cd1a966 100644
--- a/py/sequence.c
+++ b/py/sequence.c
@@ -256,7 +256,7 @@
         }
     }
 
-    mp_raise_msg(&mp_type_ValueError, "object not in sequence");
+    mp_raise_ValueError("object not in sequence");
 }
 
 mp_obj_t mp_seq_count_obj(const mp_obj_t *items, size_t len, mp_obj_t value) {