tests/ui/impl-trait/issue-87450.stderr

   1 warning: function cannot return without recursing
   2   --> $DIR/issue-87450.rs:5:1
   3    |
   4 LL | fn foo() -> impl Fn() {
   5    | ^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
   6 ...
   7 LL |     wrap(wrap(wrap(wrap(wrap(wrap(wrap(foo())))))))
   8    |                                        ----- recursive call site
   9    |
  10    = help: a `loop` may express intention better if this is on purpose
  11    = note: `#[warn(unconditional_recursion)]` on by default
  12
  13 error[E0720]: cannot resolve opaque type
  14   --> $DIR/issue-87450.rs:5:13
  15    |
  16 LL | fn foo() -> impl Fn() {
  17    |             ^^^^^^^^^ recursive opaque type
  18 ...
  19 LL |     wrap(wrap(wrap(wrap(wrap(wrap(wrap(foo())))))))
  20    |     ----------------------------------------------- returning here with type `impl Fn()`
  21 ...
  22 LL | fn wrap(f: impl Fn()) -> impl Fn() {
  23    |                          --------- returning this opaque type `impl Fn()`
  24
  25 error: aborting due to previous error; 1 warning emitted
  26
  27 For more information about this error, try `rustc --explain E0720`.