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Hint at likely cause of ast parsing failure in error message #2786

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merged 4 commits into from Jan 20, 2022
Merged

Hint at likely cause of ast parsing failure in error message #2786

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28c9ffa
Hint at likely cause of ast parsing failure in error message
emfdavid Jan 20, 2022
28d2f32
Update src/black/__init__.py
emfdavid Jan 20, 2022
10308c0
Update src/black/__init__.py
JelleZijlstra Jan 20, 2022
50506bd
Capitialization nits
ichard26 Jan 20, 2022
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5 changes: 4 additions & 1 deletion src/black/__init__.py
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Expand Up @@ -1315,7 +1315,10 @@ def assert_equivalent(src: str, dst: str, *, pass_num: int = 1) -> None:
src_ast = parse_ast(src)
except Exception as exc:
raise AssertionError(
f"cannot use --safe with this file; failed to parse source file: {exc}"
f"cannot use --safe with this file; failed to parse source file AST: "
f"{exc}\n"
f"This could be caused by running Black with an older Python version "
f"that does not support new syntax used in your source file."
) from exc

try:
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