Summary

• stop value-space arguments references from walking past a non-arrow function's implicit arguments binding
• preserve lexical capture through arrow functions and precedence for explicit parameters or local declarations
• handle named function expressions whose name binding is represented in the same Oxc scope but is outside the runtime arguments environment
• add a semantic scope snapshot covering ordinary, arrow, nested, named, and explicitly shadowed functions

Root cause

Oxc intentionally represents the implicit arguments object as an unresolved reference instead of creating a synthetic symbol. The walk-up resolver did not treat non-arrow function scopes as a boundary, so it could incorrectly attach an inner arguments reference to an outer declaration with the same name.

Validation

• env -u NO_COLOR just ready
• cargo test -p oxc_semantic --all-features
• cargo clippy -p oxc_semantic --all-targets --all-features -- -D warnings
• focused downstream tests for prefer-rest-params, no-undef, and object-shorthand

Closes #23844.

AI assistance

This change was developed with assistance from OpenAI Codex. The implementation and regression coverage were validated with the repository's full prescribed just ready workflow.