error[E0391]: cycle detected when computing type of `opaque::<impl at $DIR/unsupported.rs:29:5: 29:24>::opaque_ret::{anon_assoc#0}`
  --> $DIR/unsupported.rs:30:25
   |
LL |         reuse to_reuse::opaque_ret;
   |                         ^^^^^^^^^^
   |
note: ...which requires comparing an impl and trait method signature, inferring any hidden `impl Trait` types in the process...
  --> $DIR/unsupported.rs:30:25
   |
LL |         reuse to_reuse::opaque_ret;
   |                         ^^^^^^^^^^
   = note: ...which again requires computing type of `opaque::<impl at $DIR/unsupported.rs:29:5: 29:24>::opaque_ret::{anon_assoc#0}`, completing the cycle
note: cycle used when checking assoc item `opaque::<impl at $DIR/unsupported.rs:29:5: 29:24>::opaque_ret` is compatible with trait definition
  --> $DIR/unsupported.rs:30:25
   |
LL |         reuse to_reuse::opaque_ret;
   |                         ^^^^^^^^^^
   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error[E0391]: cycle detected when computing type of `opaque::<impl at $DIR/unsupported.rs:32:5: 32:25>::opaque_ret::{anon_assoc#0}`
  --> $DIR/unsupported.rs:33:24
   |
LL |         reuse ToReuse::opaque_ret;
   |                        ^^^^^^^^^^
   |
note: ...which requires comparing an impl and trait method signature, inferring any hidden `impl Trait` types in the process...
  --> $DIR/unsupported.rs:33:24
   |
LL |         reuse ToReuse::opaque_ret;
   |                        ^^^^^^^^^^
   = note: ...which again requires computing type of `opaque::<impl at $DIR/unsupported.rs:32:5: 32:25>::opaque_ret::{anon_assoc#0}`, completing the cycle
note: cycle used when checking assoc item `opaque::<impl at $DIR/unsupported.rs:32:5: 32:25>::opaque_ret` is compatible with trait definition
  --> $DIR/unsupported.rs:33:24
   |
LL |         reuse ToReuse::opaque_ret;
   |                        ^^^^^^^^^^
   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: recursive delegation is not supported yet
  --> $DIR/unsupported.rs:46:22
   |
LL |         pub reuse to_reuse2::foo;
   |                              --- callee defined here
...
LL |     reuse to_reuse1::foo;
   |                      ^^^

error[E0283]: type annotations needed
  --> $DIR/unsupported.rs:56:18
   |
LL |     reuse Trait::foo;
   |                  ^^^ cannot infer type
   |
   = note: cannot satisfy `_: effects::Trait`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0283, E0391.
For more information about an error, try `rustc --explain E0283`.