error: 's2' is a reserved type name and cannot be used as an identifier
  --> examples/1140-diagnostics-reserved-name-const-fn-decl.sx:14:1
   |
14 | s2 :: 5;
   | ^^

error: 'u8' is a reserved type name and cannot be used as an identifier
  --> examples/1140-diagnostics-reserved-name-const-fn-decl.sx:15:1
   |
15 | u8 :: (n: s64) -> s64 { return n + 7; }
   | ^^