error[E0391]: cycle detected when computing the super predicates of `A`
  --> $DIR/cyclic-trait-resolution.rs:1:14
   |
LL | trait A: B + A {}
   |              ^
   |
   = note: ...which immediately requires computing the super predicates of `A` again
note: cycle used when checking that `A` is well-formed
  --> $DIR/cyclic-trait-resolution.rs:1:1
   |
LL | trait A: B + A {}
   | ^^^^^^^^^^^^^^^^^
   = 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 the implied predicates of `A`
  --> $DIR/cyclic-trait-resolution.rs:1:14
   |
LL | trait A: B + A {}
   |              ^
   |
   = note: ...which immediately requires computing the implied predicates of `A` again
note: cycle used when checking that `<impl at $DIR/cyclic-trait-resolution.rs:7:1: 7:14>` is well-formed
  --> $DIR/cyclic-trait-resolution.rs:7:1
   |
LL | impl A for () {}
   | ^^^^^^^^^^^^^
   = 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: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0391`.