Negative coverage: borrow_check_statement / if / premise borrow_check_block(env, assumptions, state, &else_block.block, places_live_on_exit) => else_state
Premise at line 221. Observed failure causes: failed_judgment.
if| Line | Coverage | Source |
|---|---|---|
| 210 | ✗ | (borrow_check_expr_has_ty( env, assumptions, state, condition, Ty::bool(), Either(then_block, &else_block.block).live_before(env, &state, places_live_on_exit), ) => state) |
| 220 | 2 | (borrow_check_block(env, assumptions, state, then_block, places_live_on_exit) => then_state) |
| 221 | 3 | (borrow_check_block(env, assumptions, state, &else_block.block, places_live_on_exit) => else_state) |
| 224 | N/A | (let state: FlowState = Union((then_state, else_state)).upcast()) |
| ──────── ("if") | ||
| 226 | 28 | (borrow_check_statement(env, assumptions, state, Stmt::If { condition, then_block, else_block }, places_live_on_exit) => (env, state)) |
3 tests failed proving this premise:
Source location: tests/borrowck.rs:2158 (all coverage from this test)
fn min_problem_case_3<'a>(m: &'a mut Map) -> &'a mut Map {
exists<'r0, 'r1> {
let n: &'r0 mut Map = &'r0 mut *m;
if true {
return n;
} else {
let o: &'r1 mut Map = &'r1 mut *m;
return o;
}
}
}
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:2960 (all coverage from this test)
fn foo<'a>(m: &'a mut Map) -> &'a mut Map {
exists<'r0, 'r1> {
let n: &'r0 mut Map = &'r0 mut *m;
if false {
return n;
} else {
let o: &'r1 mut Map = &'r1 mut *m;
return o;
}
}
}
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/mir_typeck.rs:168 (all coverage from this test)
fn foo (b: bool) -> u32 {
if b {
return 1_u32;
} else {
return false;
}
}
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 "if"nll.rs:221borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:282prove_assignable failednll.rs:1067args
rule "subtype"nll.rs:1085prove failedfunction.rs:250args
rulefunction.rs:250prove_wc_list failedprove_wc_list.rs:8args
rule "some"prove_wc_list.rs:26prove_wc failedprove_wc.rs:21args
rule "subtype"prove_wc.rs:125prove_sub failedprove_sub.rs:12args
rule "normalize-l"prove_sub.rs:27prove_normalize failedprove_normalize.rs:18args
rule "normalize-r"prove_sub.rs:34prove_normalize failedprove_normalize.rs:18args
rule "if"nll.rs:221borrow_check_block failednll.rs:145args
rule "basic block"nll.rs:160borrow_check_statement failednll.rs:177args
rule "return"nll.rs:282prove_assignable failednll.rs:1067args
rule "subtype"nll.rs:1085prove failedfunction.rs:250args
rulefunction.rs:250prove_wc_list failedprove_wc_list.rs:8args
rule "some"prove_wc_list.rs:26prove_wc failedprove_wc.rs:21args
rule "subtype"prove_wc.rs:125prove_sub failedprove_sub.rs:12args
rule "normalize-l"prove_sub.rs:27prove_normalize failedprove_normalize.rs:18args
rule "normalize-r"prove_sub.rs:34prove_normalize failedprove_normalize.rs:18args