Function parse_path_pattern_atom 

pub fn parse_path_pattern_atom(atom: RawAtom) -> Result<PathPattern, AtomError>

Parse a raw atom as a PathPattern per QRY-003.

Designed for use with haz_query_lang::expr::Expr::try_map to lift an entire parsed expression to Expr<PathPattern> in one step.

Errors

Returns AtomError::InvalidPathPattern when the atom text violates PATH-001..PATH-016.