fn f() {
    matches!(c,
             'x' | 'c' | 'b' | 'B' | '?' | 'h' | 'H' | 'i' | 'I' | 'l' | 'L' | 'q' | 'Q' | 'n'
             | 'N' | 'f' | 'd' | 's' | 'p' | 'P')
}