b1d08275a9
An odd feature of Rust is that `Foo` is invalid, but `Bar` is okay:
type Foo<'a, 'b> = Box<dyn PartialEq<Foo<'a, 'b>>>;
type Bar<'a, 'b> = impl PartialEq<Bar<'a, 'b>>;
To get it right, track every time rustdoc descends into a type alias,
so if it shows up twice, it can be write the path instead of
infinitely expanding it.
26 lines
958 B
Plaintext
26 lines
958 B
Plaintext
error[E0391]: cycle detected when expanding type alias `Bar`
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--> $DIR/issue-110629-private-type-cycle-dyn.rs:1:38
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LL | type Bar<'a, 'b> = Box<dyn PartialEq<Bar<'a, 'b>>>;
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| ^^^^^^^^^^^
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= note: ...which immediately requires expanding type alias `Bar` again
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= note: type aliases cannot be recursive
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= help: consider using a struct, enum, or union instead to break the cycle
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= help: see <https://doc.rust-lang.org/reference/types.html#recursive-types> for more information
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note: cycle used when collecting item types in top-level module
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--> $DIR/issue-110629-private-type-cycle-dyn.rs:1:1
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LL | / type Bar<'a, 'b> = Box<dyn PartialEq<Bar<'a, 'b>>>;
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LL | |
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LL | |
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LL | | fn bar<'a, 'b>(i: &'a i32) -> Bar<'a, 'b> {
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... |
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LL | | assert!(bar(&meh) == bar(&muh));
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LL | | }
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| |_^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0391`.
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