in fluent/migrate/validator.py [0:0]
def generic_visit(self, node):
if isinstance(node, transforms.Source):
src = node.path
# Source needs paths to be normalized
# https://bugzilla.mozilla.org/show_bug.cgi?id=1568199
if src != mozpath.normpath(src):
self.issues.append(f'Source "{src}" needs to be a normalized path')
super().generic_visit(node)