de-flake coverage

fixes #3968, for good this time

hypothesis-python/src/hypothesis/extra/pandas/impl.py

@@ -534,7 +534,6 @@ def data_frames(
             def rows_only(draw):
                 index = draw(index_strategy)
 
-                @check_function
                 def row():
                     result = draw(rows)
                     check_type(abc.Iterable, result, "draw(row)")

hypothesis-python/src/hypothesis/strategies/_internal/core.py

@@ -83,7 +83,6 @@
     is_typed_named_tuple,
 )
 from hypothesis.internal.conjecture.utils import calc_label_from_cls, check_sample
-from hypothesis.internal.coverage import IN_COVERAGE_TESTS, description_stack
 from hypothesis.internal.entropy import get_seeder_and_restorer
 from hypothesis.internal.floats import float_of
 from hypothesis.internal.observability import TESTCASE_CALLBACKS
@@ -1758,22 +1757,8 @@ def __init__(self, definition, args, kwargs):
         self.args = args
         self.kwargs = kwargs
 
-    if IN_COVERAGE_TESTS:
-        # We do a bit of a dance here to ensure that whatever 'outer' description
-        # stack we might have, doesn't affect the validation code internal to the
-        # strategy we're drawing from.  Otherwise, we'd get flaky fails like #3968.
-        def do_draw(self, data):
-            prev = description_stack[:]
-            try:
-                description_stack.clear()
-                return self.definition(data.draw, *self.args, **self.kwargs)
-            finally:
-                description_stack[:] = prev
-
-    else:  # pragma: no cover
-
-        def do_draw(self, data):
-            return self.definition(data.draw, *self.args, **self.kwargs)
+    def do_draw(self, data):
+        return self.definition(data.draw, *self.args, **self.kwargs)
 
     def calc_label(self):
         return calc_label_from_cls(self.definition)