Negative coverage: prove_predicate / trait well formed / premise prove_after(decls, c, assumptions, &t.where_clause) => c
Premise at line 130. Observed failure causes: failed_judgment.
trait well formed| Line | Coverage | Source |
|---|---|---|
| 127 | 1 | (for_all(decls, env, assumptions, &trait_ref.parameters, &prove_wf) => c) |
| 128 | N/A | (let t = decls.trait_decl(&trait_ref.trait_id)) |
| 129 | N/A | (let t = t.binder.instantiate_with(&trait_ref.parameters).unwrap()) |
| 130 | 2 | (prove_after(decls, c, assumptions, &t.where_clause) => c) |
| ──────── ("trait well formed") | ||
| 132 | 30 | (prove_predicate(decls, env, assumptions, AtomicPredicate::WellFormedTraitRef(trait_ref)) => c) |
2 tests failed proving this premise:
Source location: tests/basic_tests.rs:34 (all coverage from this test)
#[test]
fn hello_world_fail() {
FormalityTest::new(crates![crate Foo {
trait Foo<T> where T: Bar<Self> {}
trait Bar<T> where T: Baz {}
trait Baz {}
}]).err(expect_test::expect![[r#"
crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: @ WellFormedTraitRef(Bar(!ty_0, !ty_1)), via: Bar(!ty_0, !ty_1), assumptions: {Bar(!ty_0, !ty_1)}, env: Env { variables: [!ty_1, !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: Baz(!ty_1), via: Bar(!ty_0, !ty_1), assumptions: {Bar(!ty_0, !ty_1)}, env: Env { variables: [!ty_1, !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()`"#]])
}Failed proof tree
check_all_crates failedmod.rs:42args
rule "check all prefixes"mod.rs:54check_crate failedmod.rs:61args
rule "check crate"mod.rs:74check_crate_item failedmod.rs:179rule "trait"mod.rs:188check_trait failedtraits.rs:9rule "check trait"traits.rs:22prove failedfunction.rs:250args
rulefunction.rs:250prove_predicate_list failedprove_predicate_list.rs:8args
rule "some"prove_predicate_list.rs:26prove_predicate failedprove_predicate.rs:22args
rule "trait well formed"prove_predicate.rs:130prove_after failedprove_after.rs:8args
rule "prove_after"prove_after.rs:19prove failedprove_after.rs:19args
ruleprove_after.rs:19prove_predicate_list failedprove_predicate_list.rs:8args
rule "some"prove_predicate_list.rs:26prove_predicate failedprove_predicate.rs:22args
rule "assumption"prove_predicate.rs:48prove_via failedprove_via.rs:9args
rule "trait implied bound"prove_predicate.rs:106 (failed: empty_collection)
Source location: tests/basic_tests.rs:85 (all coverage from this test)
#[test]
fn basic_where_clauses_fail() {
FormalityTest::new(crates![crate core {
#![feature(non_lifetime_binders)]
trait A<T> where T: B { }
trait B { }
trait WellFormed where for<T> u32: A<T> { }
}]).err(expect_test::expect![[r#"
crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: @ WellFormedTraitRef(A(u32, !ty_1)), via: A(u32, ?ty_2), assumptions: {for <ty> A(u32, ^ty0_0)}, env: Env { variables: [!ty_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: B(!ty_0), via: A(u32, ?ty_1), assumptions: {for <ty> A(u32, ^ty0_0)}, env: Env { variables: [!ty_0, ?ty_1], 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()`"#]])
}Failed proof tree
check_all_crates failedmod.rs:42args
rule "check all prefixes"mod.rs:54check_crate failedmod.rs:61args
rule "check crate"mod.rs:74check_crate_item failedmod.rs:179args
rule "trait"mod.rs:188check_trait failedtraits.rs:9args
rule "check trait"traits.rs:22prove failedfunction.rs:250args
rulefunction.rs:250prove_predicate_list failedprove_predicate_list.rs:8args
rule "some"prove_predicate_list.rs:26prove_predicate failedprove_predicate.rs:22args
rule "forall"prove_predicate.rs:35prove_predicate failedprove_predicate.rs:22args
rule "trait well formed"prove_predicate.rs:130prove_after failedprove_after.rs:8args
rule "prove_after"prove_after.rs:19prove failedprove_after.rs:19args
ruleprove_after.rs:19prove_predicate_list failedprove_predicate_list.rs:8args
rule "some"prove_predicate_list.rs:26prove_predicate failedprove_predicate.rs:22args
rule "assumption"prove_predicate.rs:48prove_via failedprove_via.rs:9args
rule "forall"prove_via.rs:51prove_via failedprove_via.rs:9args
rule "trait implied bound"prove_predicate.rs:106 (failed: empty_collection)