New submission from Batuhan Taskaya <isidenti...@gmail.com>:

When working on the AST validator, it is unclear that which of the changes 
caused parser to fail on valid input. I propose to propagate the error and 
raise it.

Current:
$ ./python t.py
python: Parser/pegen.c:1146: _PyPegen_run_parser: Assertion 
`PyAST_Validate(res)' failed.

Proposed:
$ ./python t.py
ValueError: Test AST error raised by the Python/ast.c

----------
components: Interpreter Core
messages: 379941
nosy: BTaskaya, gvanrossum, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: Pegen: Raise errors occurred by the AST validator

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42206>
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