error[E0391]: cycle detected when computing the super predicates of `T1`
  --> $DIR/infinite-trait-alias-recursion.rs:3:12
   |
LL | trait T1 = T2;
   |            ^^
   |
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
  --> $DIR/infinite-trait-alias-recursion.rs:3:12
   |
LL | trait T1 = T2;
   |            ^^
note: ...which requires computing the super predicates of `T2`...
  --> $DIR/infinite-trait-alias-recursion.rs:6:12
   |
LL | trait T2 = T3;
   |            ^^
note: ...which requires computing the super predicates of `T3`...
  --> $DIR/infinite-trait-alias-recursion.rs:8:12
   |
LL | trait T3 = T1 + T3;
   |            ^^
   = note: ...which again requires computing the super predicates of `T1`, completing the cycle
   = note: trait aliases cannot be recursive
note: cycle used when collecting item types in top-level module
  --> $DIR/infinite-trait-alias-recursion.rs:3:1
   |
LL | trait T1 = T2;
   | ^^^^^^^^^^^^^^

error: aborting due to previous error

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