refactor: remove more of contracts

Author: nedbat

coverage/misc.py

@@ -101,11 +101,6 @@ def _decorator(func):
     return _decorator
 
 
-def new_contract(*args_unused, **kwargs_unused):
-    """Dummy no-op implementation of `new_contract`."""
-    pass
-
-
 def nice_pair(pair):
     """Make a nice string representation of a pair of numbers.
 

coverage/numbits.py

@@ -17,14 +17,12 @@
 
 from itertools import zip_longest
 
-from coverage.misc import contract, new_contract
+from coverage.misc import contract
 
 def _to_blob(b):
     """Convert a bytestring into a type SQLite will accept for a blob."""
     return b
 
-new_contract('blob', lambda v: isinstance(v, bytes))
-
 
 @contract(nums='Iterable', returns='blob')
 def nums_to_numbits(nums):

coverage/parser.py

@@ -14,7 +14,7 @@
 from coverage.bytecode import code_objects
 from coverage.debug import short_stack
 from coverage.exceptions import NoSource, NotPython, _StopEverything
-from coverage.misc import contract, join_regex, new_contract, nice_pair
+from coverage.misc import contract, join_regex, nice_pair
 from coverage.phystokens import generate_tokens
 
 
@@ -603,11 +603,6 @@ def __new__(cls, lineno, cause=None):
         return super().__new__(cls, lineno, cause)
 
 
-# Define contract words that PyContract doesn't have.
-# ArcStarts is for a list or set of ArcStart's.
-new_contract('ArcStarts', lambda seq: all(isinstance(x, ArcStart) for x in seq))
-
-
 class NodeList:
     """A synthetic fictitious node, containing a sequence of nodes.