fix(parser): guard against tree-sitter-python infinite recursion on missing colon (!881) · Merge requests · GitLab.org / orbit / GitLab Knowledge Graph

Summary

tree-sitter-python 0.25.0 enters infinite C-level recursion during error recovery when parsing def name(args) or class name(args) without a trailing colon
The recursion is within a single C parse step, so no Rust stack guard, progress callback, or timeout can stop it
Detect the pattern before parsing and skip the file with an error
Discovered while benchmarking against the VSCode repo (14K+ files) -- extensions/copilot/test/scenarios/test-cli/wkspc1/demo.py (19 lines) crashes the process

test_python_missing_colon_detected -- verifies detection of the pattern
test_python_missing_colon_skipped_by_parser -- verifies the parser rejects the file
All 347 parser tests pass
VSCode repo (10K+ files) indexes without crash