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fca2e0cfed
Rejects initialized `let` and `const` declarations in `for...in` during parsing while preserving Annex B's non-strict `var` form. Adds misc coverage for valid and invalid initializer forms. Verified with `just ready` and parser conformance. Closes #25149. AI-assisted.
Coverage tests
Tools are tested against test262, babel and TypeScript for conformance.
Clone the test repositories beforehand:
just submodules
Development
# full run
cargo coverage
cargo coverage js # for test262
cargo coverage babel # for babel
cargo coverage ts # for typescript
# run in watch
cargo watch -x 'coverage js'
# filter for a file path
cargo watch -x 'coverage js --filter filter-file-path'
# find crash scene by turning off rayon and print out the test cases in serial
cargo coverage -- --debug
# Run after submodules are updated
UPDATE_SNAPSHOT=1 just c