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error[E0391]: cycle detected when expanding type alias `X`
--> $DIR/infinite-vec-type-recursion.rs:6:14
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LL | type X = Vec<X>;
| ^
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= note: ...which immediately requires expanding type alias `X` again
= 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 `X` is well-formed
--> $DIR/infinite-vec-type-recursion.rs:6:1
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LL | type X = Vec<X>;
| ^^^^^^
= 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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