Improve error message for attribute

hypothesis-python/src/hypothesis/searchstrategy/attrs.py

@@ -34,7 +34,7 @@ def from_attrs(target, args, kwargs, to_infer):
  fields = attr.fields(target)
  kwargs = {k: v for k, v in kwargs.items() if v is not infer}
  for name in to_infer:
- kwargs[name] = from_attrs_attribute(getattr(fields, name))
+ kwargs[name] = from_attrs_attribute(getattr(fields, name), target)
  # We might make this strategy more efficient if we added a layer here that
  # retries drawing if validation fails, for improved composition.
  # The treatment of timezones in datetimes() provides a precedent.
@@ -43,7 +43,7 @@ def from_attrs(target, args, kwargs, to_infer):
  )
 
 
-def from_attrs_attribute(attrib):
+def from_attrs_attribute(attrib, target):
  """Infer a strategy from the metadata on an attr.Attribute object."""
  # Try inferring from the default argument. Note that this will only help
  # the user passed `infer` to builds() for this attribute, but in that case
@@ -93,8 +93,8 @@ def from_attrs_attribute(attrib):
  # when we try to get a value but have lost track of where this was created.
  if strat.is_empty:
  raise ResolutionFailed(
- 'Cannot infer a strategy from the default, vaildator, type, or '
- 'converter for %r' % (attrib,))
+ 'Cannot infer a strategy from the default, validator, type, or '
+ 'converter for attribute=%r of class=%r' % (attrib, target))
  return strat