Negative coverage: borrow_check_expr / assign-op / premise prove_assignable(env, assumptions, state, rhs_ty, &place.ty) => state
Premise at line 444. Observed failure causes: failed_judgment.
assign-op| Line | Coverage | Source |
|---|---|---|
| 432 | 1 | (borrow_check_expr( env, assumptions, state, rhs, Seq(place, Assignment(place)).live_before(env, &state, places_live_on_exit), ) => (rhs_ty, state)) |
| 439 | N/A | (let places_live_before_write = Assignment(place).live_before(env, &state, places_live_on_exit)) |
| 441 | ✗ | (borrow_check_place_expr(env, assumptions, state, place) => (place, state)) |
| 442 | ✗ | (prove_ty_is_rigid(env, assumptions, state, &place.ty) => (RigidTy { name: RigidName::ScalarId(scalar), parameters: _ }, state)) |
| 443 | 1 | (if scalar.is_int()) |
| 444 | 1 | (prove_assignable(env, assumptions, state, rhs_ty, &place.ty) => state) |
| 446 | 2 | (access_permitted(env, assumptions, state, Access::new(AccessKind::Read, place), places_live_before_write) => state) |
| 447 | 1 | (access_permitted(env, assumptions, state, Access::new(AccessKind::Write, place), places_live_on_exit) => state) |
| 448 | N/A | (let state = kill_loans(place, state)) |
| ──────── ("assign-op") | ||
| 450 | 7 | (borrow_check_expr(env, assumptions, state, Expr::AssignOp { place, op: _, rhs }, places_live_on_exit) => (Ty::unit(), state)) |
1 test failed proving this premise:
Source location: tests/mir_typeck.rs:1559 (all coverage from this test)
fn foo() -> () {
let x: u32 = 1_u32;
x += 2_u8;
}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 "free fn"mod.rs:207check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:54check_fn_body failedfns.rs:61args
rule "expr fn body"fns.rs:89borrow_check failednll.rs:124args
rule "borrow_check"nll.rs:135borrow_check_block failednll.rs:142rule "basic block"nll.rs:157borrow_check_statement failednll.rs:174args
rule "expr"nll.rs:232borrow_check_expr failednll.rs:371args
rule "assign-op"nll.rs:444prove_assignable failednll.rs:1132args
rule "subtype"nll.rs:1150prove 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 "subtype"prove_predicate.rs:121prove_sub failedprove_sub.rs:12args
rule "normalize-l"prove_sub.rs:27prove_normalize failedprove_normalize.rs:22args
rule "normalize-r"prove_sub.rs:34prove_normalize failedprove_normalize.rs:22args