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Test generic_parameter_requires_explicit_sized_bound

Source location: tests/sized_trait.rs:187

#[test]
fn generic_parameter_requires_explicit_sized_bound() {
    // Generated Rust still gives T an implicit Sized bound until #500 lands.
    // Formality must already require an explicit bound on this impl.
    FormalityTest::new(crates![crate Foo {
        trait Needs<T> where T: Sized {}
        impl<T> Needs<T> for u32 {}
    }])
    .rustc_ok()
    .err(expect_test::expect![[r#"
        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = &?lt_1 ?ty_2, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: &?lt_1 ?ty_2, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = &?lt_1 mut ?ty_2, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: &?lt_1 mut ?ty_2, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0, ?lt_1, ?ty_2], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = (), via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: (), via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = bool, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: bool, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = i128, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: i128, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = i16, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: i16, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = i32, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: i32, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = i64, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: i64, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = i8, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: i8, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = isize, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: isize, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = u128, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: u128, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = u16, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: u16, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = u32, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: u32, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = u64, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: u64, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = u8, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: u8, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: !ty_0 = usize, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: !ty_0, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_normalize.rs:55:1: no applicable rules for prove_normalize_via { goal: usize, via: Sized(!ty_0), assumptions: {Sized(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        the rule "trait implied bound" at (prove_predicate.rs) failed because
          expression evaluated to an empty collection: `decls.trait_invariants()`

        the rule "trait implied bound" at (prove_predicate.rs) failed because
          expression evaluated to an empty collection: `decls.trait_invariants()`"#]]);
}

Rules proved (0)

This test records no positive coverage.

Premises failed (14)

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.

JudgmentRulePremiseAll tests of this premise
check_trait_implcheck_trait_implscope(enter_universally(Env::default(), binder) … (line 23, blamed at line 27)not counted by the judgment view
check_all_cratescheck all prefixesfor_all(i in 0..crates.len()) (let program = cra… (line 52, blamed at line 54)not counted by the judgment view
check_cratecheck cratefor_all(item in &c.items) (check_crate_item(prog… (line 73, blamed at line 74)not counted by the judgment view
check_crate_itemtrait implcheck_trait_impl(program, v, crate_id) => () (line 194)16 tests
prove_afterprove_afterprove(decls, c1.env(), assumptions, goal) => c2 (line 19)21 tests
prove_eqsymmetricprove_eq(decls, env, assumptions, r, l) => env_c (line 38)17 tests
prove_eqnormalize-lprove_normalize(decls, env, assumptions, x) => C… (line 68)17 tests
prove_normalizenormalize-via-assumptionprove_normalize_via(decls, env, assumptions, a, … (line 36)14 tests
prove_predicateassumptionprove_via(decls, env, assumptions, a, goal) => c (line 48)34 tests
prove_predicatepositive implscope(enter_existentially_with_constraints(env, … (line 60, blamed at line 71)not counted by the judgment view
prove_predicatepositive implscope(enter_existentially_with_constraints(env, … (line 60, blamed at line 78)not counted by the judgment view
prove_predicatetrait implied boundti in decls.trait_invariants() (line 106)19 tests
prove_predicateeqprove_eq(decls, env, assumptions, a, b) => c (line 115)17 tests
prove_predicate_listsomeprove_predicate(decls, env, assumptions, wc0) =>… (line 26)67 tests

Proof trees

Failed proof tree
… (200 of 343 nodes shown)

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