Negative coverage: borrow_check_expr / call / premise borrow_check_expr( env, assumptions, state, callee, args.live_before(env, &state, places_live), ) => (callee_ty, state)

Premise at line 455. Observed failure causes: failed_judgment.

6 tests failed proving this premise:

Source location: tests/borrowck.rs:4831 (all coverage from this test)

fn use_it<'a, 'b>() -> u32 {
    exists<'r0> {
        let v: Invariant<'r0> = create_invariant::<'r0>();
        if true {
            return sink::<'a, 'r0>(v);
        } else {
            return sink::<'b, 'r0>(v);
        }
    }
}

Source location: tests/borrowck.rs:4862 (all coverage from this test)

fn use_both<'a, 'b>() -> u32 {
    exists<'r0> {
        let v: Invariant<'r0> = create_invariant::<'r0>();
        let w: Invariant<'r0> = create_invariant::<'r0>();
        sink::<'a, 'r0>(v);
        sink::<'b, 'r0>(w);
        return 0_u32;
    }
}

Source location: tests/mir_typeck.rs:345 (all coverage from this test)

fn bar() -> u32 {
    let v1: u32 = foo(0_u32);
    return v1;
}

Source location: tests/mir_typeck.rs:416 (all coverage from this test)

fn bar(v1: u32) -> u32 {
    let v0: u32 = identity(v1);
    return v0;
}

Source location: tests/mir_typeck.rs:568 (all coverage from this test)

fn bar(v1: u32) -> u32 {
    let v0: u32 = identity::<u32, u32>(v1);
    return v0;
}

Source location: tests/mir_typeck.rs:1438 (all coverage from this test)

fn main() -> () { require_marker::<S>(); }
}])
tc_err(expect_test::expect![[r#"
error[E0277]: the trait bound `S: Marker` is not satisfied
  --> lib.rs
   |
13 |     require_marker::<S>();
   |                      ^ unsatisfied trait bound
   |
help: the trait `Marker` is not implemented for `S`
  --> lib.rs
   |
 3 | pub struct S {}
   | ^^^^^^^^^^^^
help: this trait has no implementations, consider adding one
  --> lib.rs
   |
 1 | pub trait Marker {}
   | ^^^^^^^^^^^^^^^^
note: required by a bound in `require_marker`
  --> lib.rs
   |
 5 | pub fn require_marker<T00>() -> ()
   |        -------------- required by a bound in this function
 6 | where
 7 |     T00: Marker,
   |          ^^^^^^ required by this bound in `require_marker`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `test` (lib) due to 1 previous error
)
(expect_test::expect![[r#"
the rule "trait implied bound" at (prove_predicate.rs) failed because
  expression evaluated to an empty collection: `decls.trait_invariants()`"#]]);
}

ng the function with a type that implements `Marker` is accepted.
#[test]
generic_fn_value_with_satisfied_where_clause() {
alityTest::new(crates![crate test {
trait Marker {}
impl Marker for u32 {}
fn require_marker<T>() -> () where T: Marker {}
fn main() -> () { require_marker::<u32>; }
}])
tc_ok()
);
}

#[test]
fn_value_with_forwarded_trait_bound() {
alityTest::new(crates![crate Foo {
trait Marker {}
impl Marker for u32 {}
fn require<T>() -> () where T: Marker {}
fn outer<T>() -> () where T: Marker { require::<T>; }
fn main() -> () { outer::<u32>(); }
}])
tc_ok()
);
}

#[test]
bare_fn_value_with_satisfied_where_clause() {
alityTest::new(crates![crate Foo {
trait Marker {}
impl Marker for u32 {}
fn require() -> () where u32: Marker {}
fn main() -> () { require; }
}])
tc_ok()
);
}

#[test]
fn_value_with_forwarded_lifetime_bound() {
alityTest::new(crates![crate Foo {
fn require<'a, 'b>() -> () where 'a: 'b {}
fn outer<'a, 'b>() -> () where 'a: 'b { require::<'a, 'b>; }
fn main() -> () { outer::<'static, 'static>(); }
}])
tc_ok()
);
}

#[test]
fn_value_with_unsatisfied_lifetime_bound() {
alityTest::new(crates![crate Foo {
fn require<'a, 'b>() -> () where 'a: 'b {}
fn outer<'a, 'b>() -> () { require::<'a, 'b>; }
fn main() -> () {}
}])
tc_err(expect_test::expect![[r#"
error: lifetime may not live long enough
 --> lib.rs
  |
7 | pub fn outer<'a00, 'a01>() -> () {
  |              ----  ---- lifetime `'a01` defined here
  |              |
  |              lifetime `'a00` defined here
8 |     require::<'a00, 'a01>;
  |     ^^^^^^^^^^^^^^^^^^^^^ requires that `'a00` must outlive `'a01`
  |
  = help: consider adding the following bound: `'a00: 'a01`

error: could not compile `Foo` (lib) due to 1 previous error
)
(expect_test::expect!["crates/formality-rust/src/prove/prove_outlives.rs:8:1: no applicable rules for prove_outlives { a: !lt_0, b: !lt_1, assumptions: {}, env: Env { variables: [!lt_0, !lt_1], bias: Soundness, pending: [], allow_pending_outlives: false } }"]);
}

ound assignment of an integer of a different type should fail.
#[test]
compound_add_mismatched_int_types() {
alityTest::new(crates![crate Foo {
fn foo() -> () {
    let x: u32 = 1_u32;
    x += 2_u8;
}

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