*: remove unused imports

nmigen/hdl/ast.py

@@ -1,8 +1,5 @@
 from abc import ABCMeta, abstractmethod
-import traceback
-import sys
 import warnings
-import typing
 import functools
 from collections import OrderedDict
 from collections.abc import Iterable, MutableMapping, MutableSet, MutableSequence

nmigen/hdl/dsl.py

@@ -1,11 +1,10 @@
-from collections import OrderedDict, namedtuple
-from collections.abc import Iterable
+from collections import OrderedDict
 from contextlib import contextmanager, _GeneratorContextManager
 from functools import wraps
 from enum import Enum
 import warnings
 
-from .._utils import flatten, bits_for, deprecated
+from .._utils import flatten, bits_for
 from .. import tracer
 from .ast import *
 from .ir import *

nmigen/hdl/ir.py

@@ -1,9 +1,7 @@
-from abc import ABCMeta, abstractmethod
+from abc import ABCMeta
 from collections import defaultdict, OrderedDict
 from functools import reduce
 import warnings
-import traceback
-import sys
 
 from .._utils import *
 from .._unused import *

nmigen/hdl/rec.py

@@ -3,7 +3,7 @@ from collections import OrderedDict
 from functools import reduce, wraps
 
 from .. import tracer
-from .._utils import union, deprecated
+from .._utils import union
 from .ast import *
 
 

nmigen/hdl/xfrm.py

@@ -2,7 +2,7 @@ from abc import ABCMeta, abstractmethod
 from collections import OrderedDict
 from collections.abc import Iterable
 
-from .._utils import flatten, deprecated
+from .._utils import flatten
 from .. import tracer
 from .ast import *
 from .ast import _StatementList