Fix docstring lints as reported by internal linter. (#180)
diff --git a/compiler/front_end/attribute_checker.py b/compiler/front_end/attribute_checker.py
index 9e7fec2..d1df30c 100644
--- a/compiler/front_end/attribute_checker.py
+++ b/compiler/front_end/attribute_checker.py
@@ -44,6 +44,7 @@
def _valid_back_ends(attr, module_source_file):
+ """Checks that `attr` holds a valid list of back end specifiers."""
if not re.match(
r"^(?:\s*[a-z][a-z0-9_]*\s*(?:,\s*[a-z][a-z0-9_]*\s*)*,?)?\s*$",
attr.value.string_constant.text,
