src/test/ui/constructor-lifetime-args.rs

   1 // All lifetime parameters in struct constructors are currently considered early bound,
   2 // i.e., `S::<ARGS>` is interpreted kinda like an associated item `S::<ARGS>::ctor`.
   3 // This behavior is a bit weird, because if equivalent constructor were written manually
   4 // it would get late bound lifetime parameters.
   5 // Variant constructors behave in the same way, lifetime parameters are considered
   6 // belonging to the enum and being early bound.
   7 // https://github.com/rust-lang/rust/issues/30904
   8
   9 struct S<'a, 'b>(&'a u8, &'b u8);
  10 enum E<'a, 'b> {
  11     V(&'a u8),
  12     U(&'b u8),
  13 }
  14
  15 fn main() {
  16     S(&0, &0); // OK
  17     S::<'static>(&0, &0);
  18     //~^ ERROR this struct takes 2 lifetime arguments but only 1 lifetime argument was supplied
  19     S::<'static, 'static, 'static>(&0, &0);
  20     //~^ ERROR this struct takes 2 lifetime arguments but 3 lifetime arguments were supplied
  21     E::V(&0); // OK
  22     E::V::<'static>(&0);
  23     //~^ ERROR this enum takes 2 lifetime arguments but only 1 lifetime argument was supplied
  24     E::V::<'static, 'static, 'static>(&0);
  25     //~^ ERROR this enum takes 2 lifetime arguments but 3 lifetime arguments were supplied
  26 }