1const a = 0x1e-4;
 2const b = 0x1e+4;
 3const c = 0x1E-4;
 4const d = 0x1E+4;
 5
 6// error
 7//
 8// :1:15: error: sign '-' cannot follow digit 'e' in hex base
 9// :2:15: error: sign '+' cannot follow digit 'e' in hex base
10// :3:15: error: sign '-' cannot follow digit 'E' in hex base
11// :4:15: error: sign '+' cannot follow digit 'E' in hex base