Negative coverage: check_drop_impl_always_applicable / Drop impl is always applicable / premise let adt_id = drop_impl_adt_id(&trait_impl)?
Premise at line 302. Observed failure causes: inapplicable.
Drop impl is always applicable| Line | Coverage | Source |
|---|---|---|
| 300 | ✗ | (if **trait_impl.trait_id() == *"Drop") |
| 302 | 1 | (let adt_id = drop_impl_adt_id(&trait_impl)?) |
| 303 | ✗ | (let adt = program.program().adt_item_named(adt_id)?.to_adt()) |
| 305 | N/A | (let (env, adt_vars) = Env::default().universal_substitution(&adt.binder)) |
| 306 | ✗ | (let adt_bound = adt.binder.instantiate_with(adt_vars)?) |
| 307 | N/A | (let adt_self_ty = Ty::rigid(adt_id, adt_vars)) |
| 310 | N/A | (let drop_trait_ref = crate::grammar::TraitId::new("Drop").with(adt_self_ty, ())) |
| 311 | 2 | (super::prove_goal(&program, &env, &adt_bound.where_clauses, Predicate::IsImplemented(drop_trait_ref.clone())) => ()) |
| ──────── ("Drop impl is always applicable") | ||
| 314 | 4 | (check_drop_impl_always_applicable(program, trait_impl) => ()) |
1 test failed proving this premise:
Source location: tests/drop.rs:152
#[test]
fn drop_impl_for_non_adt() {
FormalityTest::new(crates![
crate Foo {
impl Drop for u32 {}
}
])
.err(expect_test::expect![[r#"
the rule "Drop impl is always applicable" at (impls.rs) failed because
Drop impl self type must be a struct or enum, got `u32`"#]])
}Failed proof tree
check_all_crates failedmod.rs:41rule "check all prefixes"mod.rs:53check_crate failedmod.rs:60rule "check crate"mod.rs:73check_crate_item failedmod.rs:163rule "trait impl"mod.rs:179check_drop_impl_always_applicable failedimpls.rs:284rule "Drop impl is always applicable"impls.rs:302 (failed: inapplicable)