Function parse_arena_with 

pub fn parse_arena_with<'arena, 'src>(
    arena: &'arena Bump,
    source: &'src str,
    options: &ParseOptions,
) -> ArenaParseResult<'arena, 'src>

Parse PHP source with the given options, returning an arena-allocated ArenaParseResult.

Spans are u32, so a source over 4 GiB yields an empty program and ParseError::SourceTooLarge.