error: 'i64' is a reserved type name and cannot be used as an identifier
  --> examples/1123-diagnostics-reserved-name-catch-onfail.sx:20:13
   |
20 |     onfail (i64) { }                  // 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:21:20
   |
21 |     must(n) catch (u8) { return; };   // catch tag binding
   |                    ^^