Include underlying error when AST safety check parsing fails (#2693)

[etc/vim.git] / src / black / __init__.py

diff --git a/src/black/__init__.py b/src/black/__init__.py
index 59018d00de469c5e276a98f84cca506e44c29d80..f2efdec83b22a53d1ad00f6d1b1057dcae1f0c0f 100644 (file)
--- a/src/black/__init__.py
+++ b/src/black/__init__.py
@@ -1305,7 +1305,7 @@ def assert_equivalent(src: str, dst: str, *, pass_num: int = 1) -> None:
         src_ast = parse_ast(src)
     except Exception as exc:
         raise AssertionError(
-            "cannot use --safe with this file; failed to parse source file."
+            f"cannot use --safe with this file; failed to parse source file: {exc}"
         ) from exc
 
     try: