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Rollup merge of rust-lang#83757 - sexxi-goose:migrations_out, r=nikom…
…atsakis 2229: Support migration via rustfix - Adds support of machine applicable suggestions for `disjoint_capture_drop_reorder`. - Doesn't migrate in the case of pre-existing bugs in user code r? `@nikomatsakis`
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src/test/ui/closures/2229_closure_analysis/migrations/insignificant_drop.fixed
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| Original file line number | Diff line number | Diff line change |
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| // run-rustfix | ||
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| #![deny(disjoint_capture_drop_reorder)] | ||
| //~^ NOTE: the lint level is defined here | ||
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| // Test cases for types that implement a insignificant drop (stlib defined) | ||
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| // `t` needs Drop because one of its elements needs drop, | ||
| // therefore precise capture might affect drop ordering | ||
| fn test1_all_need_migration() { | ||
| let t = (String::new(), String::new()); | ||
| let t1 = (String::new(), String::new()); | ||
| let t2 = (String::new(), String::new()); | ||
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| let c = || { let _ = (&t, &t1, &t2); | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t`, `t1`, `t2` to be fully captured | ||
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| let _t = t.0; | ||
| let _t1 = t1.0; | ||
| let _t2 = t2.0; | ||
| }; | ||
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| c(); | ||
| } | ||
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| // String implements drop and therefore should be migrated. | ||
| // But in this test cases, `t2` is completely captured and when it is dropped won't be affected | ||
| fn test2_only_precise_paths_need_migration() { | ||
| let t = (String::new(), String::new()); | ||
| let t1 = (String::new(), String::new()); | ||
| let t2 = (String::new(), String::new()); | ||
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| let c = || { let _ = (&t, &t1); | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t`, `t1` to be fully captured | ||
| let _t = t.0; | ||
| let _t1 = t1.0; | ||
| let _t2 = t2; | ||
| }; | ||
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| c(); | ||
| } | ||
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| // If a variable would've not been captured by value then it would've not been | ||
| // dropped with the closure and therefore doesn't need migration. | ||
| fn test3_only_by_value_need_migration() { | ||
| let t = (String::new(), String::new()); | ||
| let t1 = (String::new(), String::new()); | ||
| let c = || { let _ = &t; | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t` to be fully captured | ||
| let _t = t.0; | ||
| println!("{}", t1.1); | ||
| }; | ||
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| c(); | ||
| } | ||
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| // Copy types get copied into the closure instead of move. Therefore we don't need to | ||
| // migrate then as their drop order isn't tied to the closure. | ||
| fn test4_only_non_copy_types_need_migration() { | ||
| let t = (String::new(), String::new()); | ||
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| // `t1` is Copy because all of its elements are Copy | ||
| let t1 = (0i32, 0i32); | ||
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| let c = || { let _ = &t; | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t` to be fully captured | ||
| let _t = t.0; | ||
| let _t1 = t1.0; | ||
| }; | ||
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| c(); | ||
| } | ||
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| fn test5_only_drop_types_need_migration() { | ||
| struct S(i32, i32); | ||
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| let t = (String::new(), String::new()); | ||
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| // `s` doesn't implement Drop or any elements within it, and doesn't need migration | ||
| let s = S(0i32, 0i32); | ||
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| let c = || { let _ = &t; | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t` to be fully captured | ||
| let _t = t.0; | ||
| let _s = s.0; | ||
| }; | ||
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| c(); | ||
| } | ||
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| // Since we are using a move closure here, both `t` and `t1` get moved | ||
| // even though they are being used by ref inside the closure. | ||
| fn test6_move_closures_non_copy_types_might_need_migration() { | ||
| let t = (String::new(), String::new()); | ||
| let t1 = (String::new(), String::new()); | ||
| let c = move || { let _ = (&t1, &t); | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t1`, `t` to be fully captured | ||
| println!("{} {}", t1.1, t.1); | ||
| }; | ||
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| c(); | ||
| } | ||
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| // Test migration analysis in case of Drop + Non Drop aggregates. | ||
| // Note we need migration here only because the non-copy (because Drop type) is captured, | ||
| // otherwise we won't need to, since we can get away with just by ref capture in that case. | ||
| fn test7_drop_non_drop_aggregate_need_migration() { | ||
| let t = (String::new(), String::new(), 0i32); | ||
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| let c = || { let _ = &t; | ||
| //~^ ERROR: drop order affected for closure because of `capture_disjoint_fields` | ||
| //~| HELP: add a dummy let to cause `t` to be fully captured | ||
| let _t = t.0; | ||
| }; | ||
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| c(); | ||
| } | ||
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| fn main() { | ||
| test1_all_need_migration(); | ||
| test2_only_precise_paths_need_migration(); | ||
| test3_only_by_value_need_migration(); | ||
| test4_only_non_copy_types_need_migration(); | ||
| test5_only_drop_types_need_migration(); | ||
| test6_move_closures_non_copy_types_might_need_migration(); | ||
| test7_drop_non_drop_aggregate_need_migration(); | ||
| } |
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