varid

convert ident string to hash value, and check conflict

ident prefix sz2 14 bit

ident prefix sz3 21 bit

ident prefix sz4 28 bit

ident prefix sz5 35 bit

ident prefix sz6 42 bit

ident prefix sz7 49 bit

ident prefix sz8 56 bit

ident prefix sz9 63 bit

other 7 bit

    use varid::{varid,check,conv};
    let map=varid(&["a","e","sz1apple","sz2apple","sz3apple"]).unwrap();
    assert!(check("a",map["a"]));
    assert!(check("e",map["e"]));
    assert!(check("sz2apple",map["sz2apple"]));
    assert!(check("sz3apple",map["sz3apple"]));
    assert_eq!(conv("a"),36);
    assert_eq!(conv("e"),70);
    assert_eq!(conv("sz2apple"),12857);
    assert_eq!(conv("sz3apple"),1755997);
    assert_eq!(conv("sz9apple"),4595417591438920017);