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error[E0391]: cycle detected when expanding type alias `X1`
--> $DIR/infinite-type-alias-mutual-recursion.rs:6:11
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LL | type X1 = X2;
| ^^
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note: ...which requires expanding type alias `X2`...
--> $DIR/infinite-type-alias-mutual-recursion.rs:9:11
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LL | type X2 = X3;
| ^^
note: ...which requires expanding type alias `X3`...
--> $DIR/infinite-type-alias-mutual-recursion.rs:11:11
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LL | type X3 = X1;
| ^^
= note: ...which again requires expanding type alias `X1`, completing the cycle
= note: type aliases cannot be recursive
= help: consider using a struct, enum, or union instead to break the cycle
= help: see <https://doc.rust-lang.org/reference/types.html#recursive-types> for more information
note: cycle used when checking that `X1` is well-formed
--> $DIR/infinite-type-alias-mutual-recursion.rs:6:1
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LL | type X1 = X2;
| ^^^^^^^
= 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 1 previous error
For more information about this error, try `rustc --explain E0391`.
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