diff options
Diffstat (limited to 'tests/ui/closures/2229_closure_analysis/migrations/precise_no_migrations.rs')
-rw-r--r-- | tests/ui/closures/2229_closure_analysis/migrations/precise_no_migrations.rs | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/tests/ui/closures/2229_closure_analysis/migrations/precise_no_migrations.rs b/tests/ui/closures/2229_closure_analysis/migrations/precise_no_migrations.rs new file mode 100644 index 000000000..587d71c40 --- /dev/null +++ b/tests/ui/closures/2229_closure_analysis/migrations/precise_no_migrations.rs @@ -0,0 +1,104 @@ +// run-pass + +#![deny(rust_2021_incompatible_closure_captures)] + +#[derive(Debug)] +struct Foo(i32); +impl Drop for Foo { + fn drop(&mut self) { + println!("{:?} dropped", self.0); + } +} + +struct ConstainsDropField(Foo, Foo); + +// Test that if all paths starting at root variable that implement Drop are captured +// then it doesn't trigger the lint. +fn test_precise_analysis_simple_1() { + let t = (Foo(10), Foo(20), Foo(30)); + + let c = || { + let _t = t.0; + let _t = t.1; + let _t = t.2; + }; + + c(); +} + +// Test that if all paths starting at root variable that implement Drop are captured +// then it doesn't trigger the lint. +fn test_precise_analysis_simple_2() { + let t = ConstainsDropField(Foo(10), Foo(20)); + + let c = || { + let _t = t.0; + let _t = t.1; + }; + + c(); +} + +#[derive(Debug)] +struct ContainsAndImplsDrop(Foo); +impl Drop for ContainsAndImplsDrop { + fn drop(&mut self) { + println!("{:?} dropped", self.0); + } +} + +// If a path isn't directly captured but requires Drop, then this tests that migrations aren't +// needed if the a parent to that path is captured. +fn test_precise_analysis_parent_captured_1() { + let t = ConstainsDropField(Foo(10), Foo(20)); + + let c = || { + let _t = t; + }; + + c(); +} + +// If a path isn't directly captured but requires Drop, then this tests that migrations aren't +// needed if the a parent to that path is captured. +fn test_precise_analysis_parent_captured_2() { + let t = ContainsAndImplsDrop(Foo(10)); + + let c = || { + let _t = t; + }; + + c(); +} + +struct S; +impl Drop for S { + fn drop(&mut self) {} +} + +struct T(S, S); +struct U(T, T); + +// Test that if the path is longer than just one element, precise analysis works correctly. +fn test_precise_analysis_long_path() { + let u = U(T(S, S), T(S, S)); + + let c = || { + let _x = u.0.0; + let _x = u.0.1; + let _x = u.1.0; + let _x = u.1.1; + }; + + c(); +} + +fn main() { + test_precise_analysis_simple_1(); + test_precise_analysis_simple_2(); + + test_precise_analysis_parent_captured_1(); + test_precise_analysis_parent_captured_2(); + + test_precise_analysis_long_path(); +} |