[Bug tree-optimization/64284] [5 Regression] ICE: Segmentation fault

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64284

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
trippels@gcc20 ~ % cat scp.i
int *a;
int b;
int
fn1() {
  enum { QSTRING } c = 0;
  while (1) {
    switch (*a) {
    case '\'':
      c = 0;
    default:
      switch (c)
      case 0:
      if (b)
        return 0;
      c = 1;
    }
    a++;
  }
}