src/test/ui/impl-trait/nested_impl_trait.stderr

   1 error[E0666]: nested `impl Trait` is not allowed
   2   --> $DIR/nested_impl_trait.rs:5:56
   3    |
   4 LL | fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
   5    |                                              ----------^^^^^^^^^^-
   6    |                                              |         |
   7    |                                              |         nested `impl Trait` here
   8    |                                              outer `impl Trait`
   9
  10 error[E0666]: nested `impl Trait` is not allowed
  11   --> $DIR/nested_impl_trait.rs:9:42
  12    |
  13 LL | fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}
  14    |                                ----------^^^^^^^^^^-
  15    |                                |         |
  16    |                                |         nested `impl Trait` here
  17    |                                outer `impl Trait`
  18
  19 error[E0666]: nested `impl Trait` is not allowed
  20   --> $DIR/nested_impl_trait.rs:13:37
  21    |
  22 LL | fn bad_in_arg_position(_: impl Into<impl Debug>) { }
  23    |                           ----------^^^^^^^^^^-
  24    |                           |         |
  25    |                           |         nested `impl Trait` here
  26    |                           outer `impl Trait`
  27
  28 error[E0666]: nested `impl Trait` is not allowed
  29   --> $DIR/nested_impl_trait.rs:18:44
  30    |
  31 LL |     fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
  32    |                                  ----------^^^^^^^^^^-
  33    |                                  |         |
  34    |                                  |         nested `impl Trait` here
  35    |                                  outer `impl Trait`
  36
  37 error[E0562]: `impl Trait` not allowed outside of function and method return types
  38   --> $DIR/nested_impl_trait.rs:9:32
  39    |
  40 LL | fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}
  41    |                                ^^^^^^^^^^^^^^^^^^^^^
  42
  43 error[E0562]: `impl Trait` not allowed outside of function and method return types
  44   --> $DIR/nested_impl_trait.rs:27:42
  45    |
  46 LL | fn allowed_in_ret_type() -> impl Fn() -> impl Into<u32> {
  47    |                                          ^^^^^^^^^^^^^^
  48
  49 error[E0277]: `impl Into<u32>` doesn't implement `Debug`
  50   --> $DIR/nested_impl_trait.rs:5:70
  51    |
  52 LL | fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
  53    |                                                                      ^ `impl Into<u32>` cannot be formatted using `{:?}` because it doesn't implement `Debug`
  54    |
  55 help: consider further restricting this bound
  56    |
  57 LL | fn bad_in_ret_position(x: impl Into<u32> + std::fmt::Debug) -> impl Into<impl Debug> { x }
  58    |                                          +++++++++++++++++
  59
  60 error[E0277]: `impl Into<u32>` doesn't implement `Debug`
  61   --> $DIR/nested_impl_trait.rs:18:58
  62    |
  63 LL |     fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
  64    |                                                          ^ `impl Into<u32>` cannot be formatted using `{:?}` because it doesn't implement `Debug`
  65    |
  66 help: consider further restricting this bound
  67    |
  68 LL |     fn bad(x: impl Into<u32> + std::fmt::Debug) -> impl Into<impl Debug> { x }
  69    |                              +++++++++++++++++
  70
  71 error: aborting due to 8 previous errors
  72
  73 Some errors have detailed explanations: E0277, E0562, E0666.
  74 For more information about an error, try `rustc --explain E0277`.