Negative coverage: borrow_check_statement / return / premise borrow_check_expr(env, assumptions, state, expr, LivePlaces::default()) => (expr_ty, state)
Premise at line 280. Observed failure causes: failed_judgment.
return| Line | Coverage | Source |
|---|---|---|
| 280 | 4 | (borrow_check_expr(env, assumptions, state, expr, LivePlaces::default()) => (expr_ty, state)) |
| 281 | ✗ | (if let Some(output_ty) = &env.output_ty) |
| 282 | 4 | (prove_assignable(env, assumptions, state, expr_ty, output_ty) => state) |
| 283 | N/A | (let state = state.diverges()) |
| ──────── ("return") | ||
| 285 | 81 | (borrow_check_statement(env, assumptions, state, Stmt::Return { expr }, _places_live_on_exit) => (env, state)) |
4 tests failed proving this premise:
Source location: tests/borrowck.rs:44
fn foo() -> u32 {
let x: u32;
return x;
}Failed proof tree
check_all_crates failedmod.rs:41args
rule "check all prefixes"mod.rs:53check_crate failedmod.rs:60args
rule "check crate"mod.rs:73check_crate_item failedmod.rs:178rule "free fn"mod.rs:206check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:55check_fn_body failedfns.rs:62args
rule "expr fn body"fns.rs:90borrow_check failednll.rs:127args
rule "borrow_check"nll.rs:138borrow_check_block failednll.rs:145rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:280borrow_check_expr failednll.rs:372args
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
Source location: tests/borrowck.rs:154
fn foo() -> u32 {
let x: u32;
if true {
x = 1_u32;
} else {
}
return x;
}Failed proof tree
check_all_crates failedmod.rs:41args
rule "check all prefixes"mod.rs:53check_crate failedmod.rs:60args
rule "check crate"mod.rs:73check_crate_item failedmod.rs:178rule "free fn"mod.rs:206check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:55check_fn_body failedfns.rs:62args
rule "expr fn body"fns.rs:90borrow_check failednll.rs:127args
rule "borrow_check"nll.rs:138borrow_check_block failednll.rs:145rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:280borrow_check_expr failednll.rs:372args
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
Source location: tests/borrowck.rs:1858
fn foo() -> u32 {
let x: u32;
return x;
}Failed proof tree
check_all_crates failedmod.rs:41args
rule "check all prefixes"mod.rs:53check_crate failedmod.rs:60args
rule "check crate"mod.rs:73check_crate_item failedmod.rs:178rule "free fn"mod.rs:206check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:55check_fn_body failedfns.rs:62args
rule "expr fn body"fns.rs:90borrow_check failednll.rs:127args
rule "borrow_check"nll.rs:138borrow_check_block failednll.rs:145rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:280borrow_check_expr failednll.rs:372args
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
rule "place"nll.rs:504access_permitted failednll.rs:797args
rule "access_permitted"nll.rs:809 (failed: if_false)
Source location: tests/borrowck.rs:4596
#[test]
fn flow_sensitive_invariance_use_it() {
// [nll]: rustc errors
FormalityTest::new(feature_gate_program(
NLL_GATE,
FLOW_SENSITIVE_INVARIANCE_USE_IT,
))
.skip_execute()
.err(expect_test::expect![[r#"
crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: !lt_1 : !lt_2, via: @ wf(?lt_0), assumptions: {@ wf(?lt_0)}, env: Env { variables: [!lt_1, !lt_2, ?lt_0], bias: Soundness, pending: [], allow_pending_outlives: false } }
crates/formality-rust/src/prove/prove_outlives.rs:8:1: no applicable rules for prove_outlives { a: !lt_1, b: !lt_2, assumptions: {@ wf(?lt_0)}, env: Env { variables: [!lt_1, !lt_2, ?lt_0], bias: Soundness, pending: [], allow_pending_outlives: false } }"#]]);
// [polonius]: rustc errors
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
FLOW_SENSITIVE_INVARIANCE_USE_IT,
))
.skip_execute()
.err(expect_test::expect![[r#"
crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: !lt_1 : !lt_2, via: @ wf(?lt_0), assumptions: {@ wf(?lt_0)}, env: Env { variables: [!lt_1, !lt_2, ?lt_0], bias: Soundness, pending: [], allow_pending_outlives: false } }
crates/formality-rust/src/prove/prove_outlives.rs:8:1: no applicable rules for prove_outlives { a: !lt_1, b: !lt_2, assumptions: {@ wf(?lt_0)}, env: Env { variables: [!lt_1, !lt_2, ?lt_0], bias: Soundness, pending: [], allow_pending_outlives: false } }"#]]);
// [legacy]: rustc passes
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
FLOW_SENSITIVE_INVARIANCE_USE_IT,
))
.skip_execute()
.ok();
}Failed proof tree
check_all_crates failedmod.rs:41args
rule "check all prefixes"mod.rs:53check_crate failedmod.rs:60args
rule "check crate"mod.rs:73check_crate_item failedmod.rs:178rule "free fn"mod.rs:206check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:55check_fn_body failedfns.rs:62args
rule "expr fn body"fns.rs:90borrow_check failednll.rs:127args
rule "borrow_check"nll.rs:138borrow_check_block failednll.rs:145rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "exists"nll.rs:330borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "if"nll.rs:220borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:280borrow_check_expr failednll.rs:372rule "call"nll.rs:445verify_universal_outlives failedoutlives.rs:8args
rule "verify_universal_outlives"outlives.rs:20only_assumed_outlives failedoutlives.rs:27args
rule "universal lifetime"outlives.rs:49can_outlive failedoutlives.rs:56args
rule "universal target"outlives.rs:81prove failedoutlives.rs:81args
ruleoutlives.rs:81prove_wc_list failedprove_wc_list.rs:8args
rule "some"prove_wc_list.rs:26prove_wc failedprove_wc.rs:21args
rule "assumption - relation"prove_wc.rs:54prove_via failedprove_via.rs:8args
rule "outlives"prove_wc.rs:152prove_outlives failedprove_outlives.rs:8args