error: 's64' is a reserved type name and cannot be used as an identifier
  --> examples/1123-diagnostics-reserved-name-catch-onfail.sx:20:12
   |
20 |     onfail s64 { }                  // onfail tag binding
   |            ^^^

error: 'u8' is a reserved type name and cannot be used as an identifier
  --> examples/1123-diagnostics-reserved-name-catch-onfail.sx:21:19
   |
21 |     must(n) catch u8 { return; };   // catch tag binding
   |                   ^^