- removal of code related to dataclass implementation

Author: JonAnCla

ibis/common/annotations.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import dataclasses
 import functools
 import inspect
 import types
@@ -92,7 +91,8 @@ def __str__(self):
             errors += f"\n  `{name}`: {value!r} of type {type(value)} is not {pattern.describe()}"
 
         sig = f"{self.func.__name__}{self.sig}"
-        cause = str(self.__cause__).lstrip('bind_fn() ') if self.__cause__ else ""
+        # remove the leading "_custom_bind_fn()" that comes from the custom bind function generated in SignatureBinder
+        cause = str(self.__cause__).lstrip('_custom_bind_fn() ') if self.__cause__ else ""
 
         return self.msg.format(sig=sig, call=call, cause=cause, errors=errors)
 
@@ -347,10 +347,10 @@ def __init__(self, signature: Signature):
 
         # build a new signature with default values replaced with generated variable names
         processed_signature = inspect.Signature(parameters=processed_params)
-        self.bind_fn_str = f'def bind_fn{processed_signature}:\n    return locals()'
+        self.bind_fn_str = f'def _custom_bind_fn{processed_signature}:\n    return locals()'
 
         exec(compile(self.bind_fn_str, '<string>', 'exec'), namespace)
-        self._bind_fn = namespace['bind_fn']
+        self._bind_fn = namespace['_custom_bind_fn']
 
     def __call__(self, *args, **kwargs):
        return self._bind_fn(*args, **kwargs)
@@ -581,7 +581,7 @@ def validate(self, func, args, kwargs):
         return this
 
     def validate_fast(self, func, args, kwargs):
-        """Faster validation using internal dataclass to bind args/kwargs to names instead of Signature.bind."""
+        """Faster validation using custom bind function for this signature (instead of Signature.bind)."""
         try:
             bound_kwargs = self._binder_fn(*args, **kwargs)
         except TypeError as err:
@@ -647,18 +647,6 @@ def validate_return(self, func, value):
             )
 
         return result
-    
-
-class DefaultFactory:
-    """Helper to create default factories for dataclass fields."""
-
-    __slots__ = ("value",)
-
-    def __init__(self, value):
-        self.value = value
-
-    def __call__(self):
-        return self.value
 
 
 def annotated(_1=None, _2=None, _3=None, **kwargs):