AstroidSyntaxError when parsing NewType

[cassdalton]

pylint-crash-2022-02-04-15.txt

[jacobtylerwalls]

Source

from typing import NewType

def make_new_type(t):
    new_type = NewType(f'IntRange_{t}', t)
    print(new_type)

Sanity check

% python3 -c 'from a import make_new_type; make_new_type("list")'
<function NewType.<locals>.new_type at 0x100a37040>

Traceback

% pylint a.py
Exception on node <Assign l.4 at 0x106b6d190> in file '/Users/.../pylint/a.py'
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/inference_tip.py", line 28, in _inference_tip_cached
    result = _cache[func, node]
KeyError: (<function infer_typing_typevar_or_newtype at 0x106654040>, <Call l.4 at 0x106b6d0d0>)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 181, in _data_build
    node, parser_module = _parse_string(data, type_comments=True)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 461, in _parse_string
    parsed = parser_module.parse(data + "\n", type_comments=type_comments)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/_ast.py", line 45, in parse
    return parse_func(string)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/ast.py", line 50, in parse
    return compile(source, filename, mode, flags,
  File "<unknown>", line 10
    class f'IntRange_{t}(metaclass=Meta):
                                         ^
SyntaxError: EOL while scanning string literal

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/.../pylint/pylint/utils/ast_walker.py", line 72, in walk
    callback(astroid)
  File "/Users/.../pylint/pylint/extensions/redefined_variable_type.py", line 110, in visit_assign
    _type = node_type(node.value)
  File "/Users/.../pylint/pylint/checkers/utils.py", line 1325, in node_type
    for var_type in node.infer():
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/nodes/node_ng.py", line 140, in infer
    results = list(self._explicit_inference(self, context, **kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/wrapt/wrappers.py", line 566, in __call__
    return self._self_wrapper(self.__wrapped__, self._self_instance,
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/inference_tip.py", line 30, in _inference_tip_cached
    result = _cache[func, node] = list(func(*args, **kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/brain/brain_typing.py", line 132, in infer_typing_typevar_or_newtype
    node = extract_node(TYPING_TYPE_TEMPLATE.format(typename))
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 438, in extract_node
    tree = parse(code, module_name=module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 296, in parse
    return builder.string_build(code, modname=module_name, path=path)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 155, in string_build
    module = self._data_build(data, modname, path)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/astroid/builder.py", line 183, in _data_build
    raise AstroidSyntaxError(
astroid.exceptions.AstroidSyntaxError: Parsing Python code failed:
EOL while scanning string literal (<unknown>, line 10)
************* Module a
a.py:1:0: F0002: a.py: Fatal error while checking 'a.py'. Please open an issue in our bug tracker so we address this. There is a pre-filled template that you can use in '/Users/.../Library/Caches/pylint/pylint-crash-2022-02-18-22.txt'. (astroid-error)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Version

pylint 2.13.0-dev0
astroid 2.9.2
Python 3.9.10 (v3.9.10:f2f3f53782, Jan 13 2022, 16:55:45) 
[Clang 13.0.0 (clang-1300.0.29.30)]

[DanielNoord]

@jacobtylerwalls Would you be willing to already open a PR with a test for this? This is the last issue for 2.13 without an already opened PR 😄