diff --git a/midas/checker/builtins.py b/midas/checker/builtins.py
index bc80084..ac3e737 100644
--- a/midas/checker/builtins.py
+++ b/midas/checker/builtins.py
@@ -1,4 +1,71 @@
+from midas.checker.registry import TypesRegistry
+from midas.checker.types import BaseType, Type, UnitType
+
 BUILTIN_SUBTYPES: dict[str, set[str]] = {
     "float": {"int"},
     "int": {"bool"},
 }
+
+
+def op(reg: TypesRegistry, t1: Type, operator: str, t2: Type, t3: Type):
+    reg.define_operation(
+        left=t1,
+        operator=operator,
+        right=t2,
+        result=t3,
+    )
+
+
+def basic_op(reg: TypesRegistry, type: Type, op: str):
+    reg.define_operation(
+        left=type,
+        operator=op,
+        right=type,
+        result=type,
+    )
+
+
+def define_builtins(reg: TypesRegistry):
+    """Define builtin types and operations"""
+    unit = reg.define_type("None", UnitType())
+    bool = reg.define_type("bool", BaseType(name="bool"))
+    int = reg.define_type("int", BaseType(name="int"))
+    float = reg.define_type("float", BaseType(name="float"))
+    str = reg.define_type("str", BaseType(name="str"))
+
+    basic_op(reg, int, "__add__")  # int + int = int
+    basic_op(reg, int, "__sub__")  # int - int = int
+    basic_op(reg, int, "__mul__")  # int * int = int
+    basic_op(reg, int, "__pow__")  # int ** int = int
+    basic_op(reg, int, "__mod__")  # int % int = int
+    basic_op(reg, int, "__and__")  # int & int = int
+    basic_op(reg, int, "__or__")  # int | int = int
+    basic_op(reg, int, "__xor__")  # int ^ int = int
+    op(reg, int, "__lt__", int, bool)  # int < int = bool
+    op(reg, int, "__gt__", int, bool)  # int > int = bool
+    op(reg, int, "__le__", int, bool)  # int <= int = bool
+    op(reg, int, "__ge__", int, bool)  # int >= int = bool
+    op(reg, int, "__eq__", int, bool)  # int == int = bool
+    basic_op(reg, float, "__add__")  # float + float = float
+    basic_op(reg, float, "__sub__")  # float - float = float
+    basic_op(reg, float, "__mul__")  # float * float = float
+    basic_op(reg, float, "__truediv__")  # float / float = float
+    op(reg, float, "__lt__", float, bool)  # float < float = bool
+    op(reg, float, "__gt__", float, bool)  # float > float = bool
+    op(reg, float, "__le__", float, bool)  # float <= float = bool
+    op(reg, float, "__ge__", float, bool)  # float >= float = bool
+    op(reg, float, "__eq__", float, bool)  # float == float = bool
+    basic_op(reg, str, "__add__")  # str + str = str
+    op(reg, str, "__eq__", str, bool)  # str == str = bool
+
+    op(reg, int, "__lt__", float, bool)  # int < float = bool
+    op(reg, int, "__gt__", float, bool)  # int > float = bool
+    op(reg, int, "__le__", float, bool)  # int <= float = bool
+    op(reg, int, "__ge__", float, bool)  # int >= float = bool
+    op(reg, int, "__eq__", float, bool)  # int == float = bool
+
+    op(reg, float, "__lt__", int, bool)  # float < int = bool
+    op(reg, float, "__gt__", int, bool)  # float > int = bool
+    op(reg, float, "__le__", int, bool)  # float <= int = bool
+    op(reg, float, "__ge__", int, bool)  # float >= int = bool
+    op(reg, float, "__eq__", int, bool)  # float == int = bool
diff --git a/midas/checker/midas.py b/midas/checker/midas.py
index 37a856d..a7ce36f 100644
--- a/midas/checker/midas.py
+++ b/midas/checker/midas.py
@@ -2,6 +2,7 @@ import logging
 from typing import Optional
 
 import midas.ast.midas as m
+from midas.checker.builtins import define_builtins
 from midas.checker.registry import TypesRegistry
 from midas.checker.reporter import FileReporter, Reporter
 from midas.checker.types import (
@@ -15,7 +16,6 @@ from midas.checker.types import (
 from midas.lexer.midas import MidasLexer
 from midas.lexer.token import Token
 from midas.parser.midas import MidasParser
-from midas.resolver.builtin import define_builtins
 
 
 class MidasTyper(m.Stmt.Visitor[None], m.Expr.Visitor[None], m.Type.Visitor[Type]):
diff --git a/midas/resolver/builtin.py b/midas/resolver/builtin.py
deleted file mode 100644
index c3c7e65..0000000
--- a/midas/resolver/builtin.py
+++ /dev/null
@@ -1,66 +0,0 @@
-from midas.checker.registry import TypesRegistry
-from midas.checker.types import BaseType, Type, UnitType
-
-
-def op(reg: TypesRegistry, t1: Type, operator: str, t2: Type, t3: Type):
-    reg.define_operation(
-        left=t1,
-        operator=operator,
-        right=t2,
-        result=t3,
-    )
-
-
-def basic_op(reg: TypesRegistry, type: Type, op: str):
-    reg.define_operation(
-        left=type,
-        operator=op,
-        right=type,
-        result=type,
-    )
-
-
-def define_builtins(reg: TypesRegistry):
-    """Define builtin types and operations"""
-    unit = reg.define_type("None", UnitType())
-    bool = reg.define_type("bool", BaseType(name="bool"))
-    int = reg.define_type("int", BaseType(name="int"))
-    float = reg.define_type("float", BaseType(name="float"))
-    str = reg.define_type("str", BaseType(name="str"))
-
-    basic_op(reg, int, "__add__")  # int + int = int
-    basic_op(reg, int, "__sub__")  # int - int = int
-    basic_op(reg, int, "__mul__")  # int * int = int
-    basic_op(reg, int, "__pow__")  # int ** int = int
-    basic_op(reg, int, "__mod__")  # int % int = int
-    basic_op(reg, int, "__and__")  # int & int = int
-    basic_op(reg, int, "__or__")  # int | int = int
-    basic_op(reg, int, "__xor__")  # int ^ int = int
-    op(reg, int, "__lt__", int, bool)  # int < int = bool
-    op(reg, int, "__gt__", int, bool)  # int > int = bool
-    op(reg, int, "__le__", int, bool)  # int <= int = bool
-    op(reg, int, "__ge__", int, bool)  # int >= int = bool
-    op(reg, int, "__eq__", int, bool)  # int == int = bool
-    basic_op(reg, float, "__add__")  # float + float = float
-    basic_op(reg, float, "__sub__")  # float - float = float
-    basic_op(reg, float, "__mul__")  # float * float = float
-    basic_op(reg, float, "__truediv__")  # float / float = float
-    op(reg, float, "__lt__", float, bool)  # float < float = bool
-    op(reg, float, "__gt__", float, bool)  # float > float = bool
-    op(reg, float, "__le__", float, bool)  # float <= float = bool
-    op(reg, float, "__ge__", float, bool)  # float >= float = bool
-    op(reg, float, "__eq__", float, bool)  # float == float = bool
-    basic_op(reg, str, "__add__")  # str + str = str
-    op(reg, str, "__eq__", str, bool)  # str == str = bool
-
-    op(reg, int, "__lt__", float, bool)  # int < float = bool
-    op(reg, int, "__gt__", float, bool)  # int > float = bool
-    op(reg, int, "__le__", float, bool)  # int <= float = bool
-    op(reg, int, "__ge__", float, bool)  # int >= float = bool
-    op(reg, int, "__eq__", float, bool)  # int == float = bool
-
-    op(reg, float, "__lt__", int, bool)  # float < int = bool
-    op(reg, float, "__gt__", int, bool)  # float > int = bool
-    op(reg, float, "__le__", int, bool)  # float <= int = bool
-    op(reg, float, "__ge__", int, bool)  # float >= int = bool
-    op(reg, float, "__eq__", int, bool)  # float == int = bool