Negative coverage: borrow_check_statement / exists / premise borrow_check_block(env, assumptions_body, state, block, places_live_on_exit) => state
Premise at line 330. Observed failure causes: failed_judgment.
exists| Line | Coverage | Source |
|---|---|---|
| 322 | ✗ | (if !feature_gate_enabled_in_program(&env.program, &FeatureGateName::PoloniusUnlocked) && !feature_gate_enabled_in_program(&env.program, &FeatureGateName::PoloniusAlpha)) |
| 324 | N/A | (let (env, subst, block) = env.instantiate_existentially(binder)) |
| 325 | N/A | (let assumptions_body = (assumptions, wf_assumptions_for_existential_subst(&subst))) |
| 326 | N/A | (let entry_state = state.clone()) |
| 327 | 23 | (borrow_check_block(env, assumptions_body, state, block, places_live_on_exit) => state) |
| 329 | N/A | (let state = entry_state.with_global_outlives_from(&state)) |
| 330 | 6 | (borrow_check_block(env, assumptions_body, state, block, places_live_on_exit) => state) |
| 331 | N/A | (let state = state.pop_subst(&env.env, subst)) |
| ──────── ("exists") | ||
| 333 | 54 | (borrow_check_statement(env, assumptions, state, Stmt::Exists { binder }, places_live_on_exit) => (env, state)) |
6 tests failed proving this premise:
Source location: tests/borrowck.rs:1989
#[test]
fn min_problem_case_3() {
FormalityTest::new(feature_gate_program(NLL_GATE, MIN_PROBLEM_CASE_3))
.skip_execute()
.err(expect_test::expect![[r#"
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
&access.place = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `m`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
place_loaned_ref = m : &!lt_1 mut Map"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
MIN_PROBLEM_CASE_3,
))
.skip_execute()
.ok();
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
MIN_PROBLEM_CASE_3,
))
.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:221borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
Source location: tests/borrowck.rs:2798
#[test]
fn if_false_borrowck() {
FormalityTest::new(feature_gate_program(NLL_GATE, IF_FALSE_BORROWCK))
.skip_execute()
.err(expect_test::expect![[r#"
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
&access.place = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `m`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(m : &!lt_1 mut Map) : <&!lt_1 mut Map as Derefable>::Target
place_loaned_ref = m : &!lt_1 mut Map"#]]);
FormalityTest::new(feature_gate_program(POLONIUS_ALPHA_GATE, IF_FALSE_BORROWCK))
.skip_execute()
.ok();
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
IF_FALSE_BORROWCK,
))
.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:221borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
Source location: tests/borrowck.rs:3230
#[test]
fn outlive_before_return_does_not_affect_merged_paths() {
FormalityTest::new(feature_gate_program(
NLL_GATE,
OUTLIVE_BEFORE_RETURN_DOES_NOT_AFFECT_MERGED_PATHS,
))
.skip_execute()
.err(expect_test::expect![[r#"
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(a : &!lt_1 mut u8) : <&!lt_1 mut u8 as Derefable>::Target
&access.place = *(a : &!lt_1 mut u8) : <&!lt_1 mut u8 as Derefable>::Target
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3, ?lt_4, ?lt_5}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `a`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(a : &!lt_1 mut u8) : <&!lt_1 mut u8 as Derefable>::Target
place_loaned_ref = a : &!lt_1 mut u8"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
OUTLIVE_BEFORE_RETURN_DOES_NOT_AFFECT_MERGED_PATHS,
))
.skip_execute()
.ok();
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
OUTLIVE_BEFORE_RETURN_DOES_NOT_AFFECT_MERGED_PATHS,
))
.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 "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
Source location: tests/borrowck.rs:4316
#[test]
fn issue_46859_decoder_next() {
// [nll]: rustc errors
FormalityTest::new(feature_gate_program(NLL_GATE, ISSUE_46859_DECODER_NEXT))
.skip_execute()
.err(expect_test::expect![[r#"
the rule "fixed-point" at (nll.rs) failed because
condition evaluated to false: `state0 == state1`
state0 = flow_state([scope(some(U(1)), None, {}, None, [(d, &!lt_1 mut Decoder)], [d : &!lt_1 mut Decoder]), scope(some(U(1)), None, {}, None, [], []), scope(some(U(3)), None, {}, None, [], []), scope(some(U(3)), Some('l), {}, Some({(* d) . buf_read}), [], [])], point_flow_state({pending_outlives(!lt_1, ?lt_2), pending_outlives(?lt_2, ?lt_3), pending_outlives(?lt_3, !lt_1)}, {}, {}), {}, {}, {pending_outlives(!lt_1, ?lt_2), pending_outlives(?lt_2, ?lt_3), pending_outlives(?lt_3, !lt_1)})
state1 = flow_state([scope(some(U(1)), None, {}, None, [(d, &!lt_1 mut Decoder)], [d : &!lt_1 mut Decoder]), scope(some(U(1)), None, {}, None, [], []), scope(some(U(3)), None, {}, None, [], []), scope(some(U(3)), Some('l), {}, Some({(* d) . buf_read}), [], [])], point_flow_state({pending_outlives(!lt_1, ?lt_2), pending_outlives(?lt_2, ?lt_3), pending_outlives(?lt_3, !lt_1)}, {loan(?lt_2, *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32, mut)}, {}), {}, {}, {pending_outlives(!lt_1, ?lt_2), pending_outlives(?lt_2, ?lt_3), pending_outlives(?lt_3, !lt_1)})
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
&access.place = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `*(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct]`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `d`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
place_loaned_ref = d : &!lt_1 mut Decoder
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
&access.place = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `*(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct]`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `d`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(d : &!lt_1 mut Decoder) : <&!lt_1 mut Decoder as Derefable>::Target . buf_read[Decoder , struct] : u32
place_loaned_ref = d : &!lt_1 mut Decoder"#]]);
// [polonius]: rustc passes
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
ISSUE_46859_DECODER_NEXT,
))
.skip_execute()
.ok();
// [legacy]: rustc passes
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
ISSUE_46859_DECODER_NEXT,
))
.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 "loop"nll.rs:247borrow_check_loop failednll.rs:575args
rule "fixed-point"nll.rs:596 (failed: if_false)rule "loop"nll.rs:589borrow_check_loop failednll.rs:575args
rule "fixed-point"nll.rs:595borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "call"nll.rs:443borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
rule "loop"nll.rs:587borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "call"nll.rs:443borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
Source location: tests/borrowck.rs:4458
#[test]
fn issue_92985_filtering_lending_iterator() {
// [nll]: rustc errors
FormalityTest::new(feature_gate_program(NLL_GATE, ISSUE_92985_FILTER_NEXT))
.skip_execute()
.err(expect_test::expect![[r#"
the rule "fixed-point" at (nll.rs) failed because
condition evaluated to false: `state0 == state1`
state0 = flow_state([scope(some(U(1)), None, {}, None, [(f, &!lt_1 mut Filter)], [f : &!lt_1 mut Filter]), scope(some(U(1)), None, {}, None, [], []), scope(some(U(4)), None, {}, None, [], []), scope(some(U(4)), Some('l), {}, Some({(* f) . iter, (* f) . predicate}), [], [])], point_flow_state({pending_outlives(!lt_1, ?lt_2), pending_outlives(!lt_1, ?lt_3), pending_outlives(?lt_2, !lt_1), pending_outlives(?lt_2, ?lt_4)}, {}, {}), {}, {}, {pending_outlives(!lt_1, ?lt_2), pending_outlives(!lt_1, ?lt_3), pending_outlives(?lt_2, !lt_1), pending_outlives(?lt_2, ?lt_4)})
state1 = flow_state([scope(some(U(1)), None, {}, None, [(f, &!lt_1 mut Filter)], [f : &!lt_1 mut Filter]), scope(some(U(1)), None, {}, None, [], []), scope(some(U(4)), None, {}, None, [], []), scope(some(U(4)), Some('l), {}, Some({(* f) . iter, (* f) . predicate}), [], [])], point_flow_state({pending_outlives(!lt_1, ?lt_2), pending_outlives(!lt_1, ?lt_3), pending_outlives(?lt_2, !lt_1), pending_outlives(?lt_2, ?lt_4)}, {loan(?lt_2, *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32, mut), loan(?lt_3, *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . predicate[Filter , struct] : u32, mut)}, {}), {labeled_flow_state('l, point_flow_state({pending_outlives(!lt_1, ?lt_2), pending_outlives(!lt_1, ?lt_3), pending_outlives(?lt_2, !lt_1), pending_outlives(?lt_2, ?lt_4)}, {loan(?lt_2, *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32, mut)}, {}))}, {}, {pending_outlives(!lt_1, ?lt_2), pending_outlives(!lt_1, ?lt_3), pending_outlives(?lt_2, !lt_1), pending_outlives(?lt_2, ?lt_4)})
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
&access.place = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3, ?lt_4}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `*(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct]`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `f`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
place_loaned_ref = f : &!lt_1 mut Filter
the rule "borrow of disjoint places" at (nll.rs) failed because
condition evaluated to false: `place_disjoint_from_place(&loan.place, &access.place)`
&loan.place = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
&access.place = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
the rule "loan_cannot_outlive" at (nll.rs) failed because
condition evaluated to false: `!outlived_by_loan.contains(&lifetime.upcast())`
outlived_by_loan = {!lt_1, ?lt_2, ?lt_3, ?lt_4}
&lifetime.upcast() = !lt_1
the rule "loan_not_required_by_universal_regions" at (nll.rs) failed because
condition evaluated to false: `outlived_by_loan.iter().all(|p| match p
{
Parameter::Ty(_) => false, Parameter::Lt(lt) => match lt.as_ref()
{
Lt::Static => false, Lt::Variable(Variable::UniversalVar(_)) => false,
Lt::Variable(Variable::ExistentialVar(_)) => true,
Lt::Variable(Variable::BoundVar(_)) =>
panic!("cannot outlive a bound var"), Lt::Erased => true,
}, Parameter::Const(_) => panic!("cannot outlive a constant"),
})`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `*(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct]`
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `f`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(f : &!lt_1 mut Filter) : <&!lt_1 mut Filter as Derefable>::Target . iter[Filter , struct] : u32
place_loaned_ref = f : &!lt_1 mut Filter"#]]);
// [polonius]: rustc passes
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
ISSUE_92985_FILTER_NEXT,
))
.skip_execute()
.ok();
// [legacy]: rustc passes
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
ISSUE_92985_FILTER_NEXT,
))
.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 "loop"nll.rs:247borrow_check_loop failednll.rs:575args
rule "fixed-point"nll.rs:596 (failed: if_false)rule "loop"nll.rs:589borrow_check_loop failednll.rs:575args
rule "fixed-point"nll.rs:595borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "call"nll.rs:443borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (failed: if_false)
rule "loop"nll.rs:587borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "let"nll.rs:194borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "call"nll.rs:443borrow_check_expr_has_ty failednll.rs:351rule "block"nll.rs:364borrow_check_expr failednll.rs:372rule "ref"nll.rs:478access_permitted failednll.rs:797rule "access_permitted"nll.rs:813access_permitted_by_loans failednll.rs:820rule "access_permitted_by_loans"nll.rs:833access_permitted_by_loan failednll.rs:840args
rule "borrow of disjoint places"nll.rs:855 (failed: if_false)rule "loan is dead"nll.rs:902loan_not_required_by_live_places failednll.rs:1226rule "loan_not_required_by_live_places"nll.rs:1251loan_not_required_by_live_place failednll.rs:1258args
rule "loan is not required by type"nll.rs:1278loan_not_required_by_parameter failednll.rs:1326args
rule "rigid-ty"nll.rs:1346loan_not_required_by_parameters failednll.rs:1463args
rule "loan_not_required_by_parameters"nll.rs:1484loan_not_required_by_parameter failednll.rs:1326args
rule "lifetime"nll.rs:1436loan_cannot_outlive failednll.rs:1443args
rule "loan_cannot_outlive"nll.rs:1456 (failed: if_false)
rule "universal-variable"nll.rs:1420loan_cannot_outlive_universal_regions failednll.rs:1170args
rule "loan_not_required_by_universal_regions"nll.rs:1197 (failed: if_false)
rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:882 (failed: if_let)rule "write-indirect"nll.rs:884 (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