Function in_limit_arg_position 

pub fn in_limit_arg_position(text: &str, offset: usize) -> bool

v0.142 (ADR 0165): the cursor is at an argument-name position inside a @limit( … ) — the innermost open paren is opened by the limit annotation (@limit, not a bare limit( call), and the current argument segment has no : yet. Mirrors in_cache_arg_position.