src/test/ui/traits/issue-91949-hangs-on-recursion.stderr

   1 warning: function cannot return without recursing
   2   --> $DIR/issue-91949-hangs-on-recursion.rs:23:1
   3    |
   4 LL | / fn recurse<T>(elements: T) -> Vec<char>
   5 LL | | where
   6 LL | |     T: Iterator<Item = ()>,
   7    | |___________________________^ cannot return without recursing
   8 LL |   {
   9 LL |       recurse(IteratorOfWrapped(elements).map(|t| t.0))
  10    |       ------------------------------------------------- recursive call site
  11    |
  12    = help: a `loop` may express intention better if this is on purpose
  13    = note: `#[warn(unconditional_recursion)]` on by default
  14
  15 error[E0275]: overflow evaluating the requirement `(): Sized`
  16    |
  17    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "512"]` attribute to your crate (`issue_91949_hangs_on_recursion`)
  18    = note: required for `std::iter::Empty<()>` to implement `Iterator`
  19    = note: 171 redundant requirements hidden
  20    = note: required for `IteratorOfWrapped<(), Map<IteratorOfWrapped<(), Map<IteratorOfWrapped<(), Map<..., ...>>, ...>>, ...>>` to implement `Iterator`
  21    = note: the full type name has been written to '$TEST_BUILD_DIR/traits/issue-91949-hangs-on-recursion/issue-91949-hangs-on-recursion.long-type-hash.txt'
  22
  23 error: aborting due to previous error; 1 warning emitted
  24
  25 For more information about this error, try `rustc --explain E0275`.