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[parser] Fix panic when parsing IPython escape command expressions (#21480)

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## Summary

Fixes a panic when parsing IPython escape commands with `Help` kind
(`?`) in expression contexts. The parser now reports an error instead of
panicking.

Fixes #21465.

## Problem

The parser panicked with `unreachable!()` in
`parse_ipython_escape_command_expression` when encountering escape
commands with `Help` kind (`?`) in expression contexts, where only
`Magic` (`%`) and `Shell` (`!`) are allowed.

## Approach

Replaced the `unreachable!()` panic with error handling that adds a
`ParseErrorType::OtherError` and continues parsing, returning a valid
AST node with the error attached.

## Test Plan

Added `test_ipython_escape_command_in_with_statement` and
`test_ipython_help_escape_command_as_expression` to verify the fix.

---------

Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>
This commit is contained in:
Dan Parizher
2025-11-24 00:40:27 -05:00
committed by GitHub
parent 3b23d3c041
commit 474b00568a
7 changed files with 307 additions and 1 deletions
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3
crates/ruff_python_parser/resources/inline/err/ipython_help_escape_command_error_recovery_1.py Normal file
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@@ -0,0 +1,3 @@
# parse_options: {"mode": "ipython"}
with (a, ?b)
?

3
crates/ruff_python_parser/resources/inline/err/ipython_help_escape_command_error_recovery_2.py Normal file
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@@ -0,0 +1,3 @@
# parse_options: {"mode": "ipython"}
with (a, ?b
?

4
crates/ruff_python_parser/resources/inline/err/ipython_help_escape_command_error_recovery_3.py Normal file
View File

@@ -0,0 +1,4 @@
# parse_options: {"mode": "ipython"}
with a, ?b
?
x = 1