Test direct_cycle

Source location: crates/formality-rust/src/prove/test/occurs_check.rs:24

#[test]
fn direct_cycle() {
    test_prove(decls(), term("exists<A> {} => {A = Vec<A>}")).assert_err(expect![[r#"
        failed at (proven_set.rs) because
          `?ty_0` occurs in `Vec<?ty_0>`

        crates/formality-rust/src/prove/prove_normalize.rs:18:1: no applicable rules for prove_normalize { p: ?ty_0, assumptions: {}, env: Env { variables: [?ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:18:1: no applicable rules for prove_normalize { p: Vec<?ty_0>, assumptions: {}, env: Env { variables: [?ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }"#]]);
}

Rules proved (0)

This test records no positive coverage.

Premises failed (6)

The last column links to the premise’s page when the judgment view counts this failure against that premise. It does not when the premise is read as infallible, or when the failure was blamed inside a multi-line premise that carries no record on its own first line.

Proof trees