fn is_word_char(c: Self::Element) -> bool {
        let c = c.as_u32();
        'a' as u32 <= c && c <= 'z' as u32
            || 'A' as u32 <= c && c <= 'Z' as u32
            || '0' as u32 <= c && c <= '9' as u32
            || c == '_' as u32
    }
/// \return whether this is a word char.
/// ES9 21.2.2.6.2.
\return whether this is a word char.
\ return whether this is a word char .
fn is_word_char(c: Self::Element) -> bool {
        let c = c.as_u32();
        'a' as u32 <= c && c <= 'z' as u32
            || 'A' as u32 <= c && c <= 'Z' as u32
            || '0' as u32 <= c && c <= '9' as u32
            || c == '_' as u32
    }
fn is_word_char ( c : Self :: Element ) -> bool { let c = c . as_u32 ( ) ; 'a' as u32 <= c && c <= 'z' as u32 || 'A' as u32 <= c && c <= 'Z' as u32 || '0' as u32 <= c && c <= '9' as u32 || c == '_' as u32 }
\return whether this is a word char.
\ return whether this is a word char .
c
Self::Element