Negative coverage: borrow_check_loop / fixed-point / premise if state0 == state1
Premise at line 596. Observed failure causes: if_false.
fixed-point| Line | Coverage | Source |
|---|---|---|
| 595 | 10 | (borrow_check_block(env, assumptions, state0, body, places_live_on_exit) => state1) |
| 596 | 4 | (if state0 == state1) |
| ──────── ("fixed-point") | ||
| 598 | 34 | (borrow_check_loop(env, assumptions, state0, body, places_live_on_exit) => state1) |
4 tests failed proving this premise:
Source location: tests/borrowck.rs:3917
#[test]
fn issue_57165_conditional() {
FormalityTest::new(feature_gate_program(NLL_GATE, ISSUE_57165_CONDITIONAL))
.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(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut)}, {}), {}, {}, {pending_outlives(?lt_2, ?lt_1)})
state1 = flow_state([scope(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}), {labeled_flow_state('l, point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}))}, {}, {pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X
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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
ISSUE_57165_CONDITIONAL,
))
.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(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut)}, {}), {}, {}, {pending_outlives(?lt_2, ?lt_1)})
state1 = flow_state([scope(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}), {labeled_flow_state('l, point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}))}, {}, {pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X
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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
ISSUE_57165_CONDITIONAL,
))
.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:327borrow_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)
Source location: tests/borrowck.rs:3964
#[test]
fn issue_57165_conditional() {
FormalityTest::new(feature_gate_program(NLL_GATE, ISSUE_57165_CONDITIONAL))
.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(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut)}, {}), {}, {}, {pending_outlives(?lt_2, ?lt_1)})
state1 = flow_state([scope(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}), {labeled_flow_state('l, point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}))}, {}, {pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X
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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_ALPHA_GATE,
ISSUE_57165_CONDITIONAL,
))
.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(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut)}, {}), {}, {}, {pending_outlives(?lt_2, ?lt_1)})
state1 = flow_state([scope(none, None, {}, None, [], []), scope(none, None, {}, None, [], []), scope(some(U(4)), None, {}, None, [(b, X), (p, &?lt_1 mut X)], [b : X, p : &?lt_1 mut X]), scope(some(U(4)), Some('l), {}, Some({* p}), [], [])], point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}), {labeled_flow_state('l, point_flow_state({pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1)}, {loan(?lt_2, b : X, mut), loan(?lt_3, *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target, mut)}, {}))}, {}, {pending_outlives(?lt_1, ?lt_3), pending_outlives(?lt_2, ?lt_1), pending_outlives(?lt_3, ?lt_4), pending_outlives(?lt_4, ?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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X
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 = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
&access.place = *(p : &?lt_1 mut X) : <&?lt_1 mut X 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_3, ?lt_4}
&lifetime.upcast() = ?lt_1
the rule "write-indirect" at (nll.rs) failed because
pattern `TypedPlaceExpressionData::Deref(place_loaned_ref)` did not match value `p`
the rule "write-indirect" at (nll.rs) failed because
condition evaluated to false: `place_accessed.is_prefix_of(place_loaned_ref)`
place_accessed = *(p : &?lt_1 mut X) : <&?lt_1 mut X as Derefable>::Target
place_loaned_ref = p : &?lt_1 mut X"#]]);
FormalityTest::new(feature_gate_program(
POLONIUS_UNLOCKED_GATE,
ISSUE_57165_CONDITIONAL,
))
.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:311borrow_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)
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)
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)