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Diffstat (limited to 'tests/ui/rfc-1445-restrict-constants-in-patterns/fn-ptr-is-structurally-matchable.rs')
-rw-r--r-- | tests/ui/rfc-1445-restrict-constants-in-patterns/fn-ptr-is-structurally-matchable.rs | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/tests/ui/rfc-1445-restrict-constants-in-patterns/fn-ptr-is-structurally-matchable.rs b/tests/ui/rfc-1445-restrict-constants-in-patterns/fn-ptr-is-structurally-matchable.rs deleted file mode 100644 index 2b3fbd2a4..000000000 --- a/tests/ui/rfc-1445-restrict-constants-in-patterns/fn-ptr-is-structurally-matchable.rs +++ /dev/null @@ -1,135 +0,0 @@ -// run-pass - -// This file checks that fn ptrs are considered structurally matchable. -// See also rust-lang/rust#63479. - -fn main() { - let mut count = 0; - - // A type which is not structurally matchable: - struct NotSM; - - // And one that is: - #[derive(PartialEq, Eq)] - struct SM; - - fn trivial() {} - - fn sm_to(_: SM) {} - fn not_sm_to(_: NotSM) {} - fn to_sm() -> SM { SM } - fn to_not_sm() -> NotSM { NotSM } - - // To recreate the scenario of interest in #63479, we need to add - // a ref-level-of-indirection so that we descend into the type. - - fn r_sm_to(_: &SM) {} - fn r_not_sm_to(_: &NotSM) {} - fn r_to_r_sm(_: &()) -> &SM { &SM } - fn r_to_r_not_sm(_: &()) -> &NotSM { &NotSM } - - #[derive(PartialEq, Eq)] - struct Wrap<T>(T); - - // In the code below, we put the match input into a local so that - // we can assign it an explicit type that is an fn ptr instead of - // a singleton type of the fn itself that the type inference would - // otherwise assign. - - // Check that fn() is structural-match - const CFN1: Wrap<fn()> = Wrap(trivial); - let input: Wrap<fn()> = Wrap(trivial); - match Wrap(input) { - Wrap(CFN1) => count += 1, - Wrap(_) => {} - }; - - // Check that fn(T) is structural-match when T is too. - const CFN2: Wrap<fn(SM)> = Wrap(sm_to); - let input: Wrap<fn(SM)> = Wrap(sm_to); - match Wrap(input) { - Wrap(CFN2) => count += 1, - Wrap(_) => {} - }; - - // Check that fn() -> T is structural-match when T is too. - const CFN3: Wrap<fn() -> SM> = Wrap(to_sm); - let input: Wrap<fn() -> SM> = Wrap(to_sm); - match Wrap(input) { - Wrap(CFN3) => count += 1, - Wrap(_) => {} - }; - - // Check that fn(T) is structural-match even if T is not. - const CFN4: Wrap<fn(NotSM)> = Wrap(not_sm_to); - let input: Wrap<fn(NotSM)> = Wrap(not_sm_to); - match Wrap(input) { - Wrap(CFN4) => count += 1, - Wrap(_) => {} - }; - - // Check that fn() -> T is structural-match even if T is not. - const CFN5: Wrap<fn() -> NotSM> = Wrap(to_not_sm); - let input: Wrap<fn() -> NotSM> = Wrap(to_not_sm); - match Wrap(input) { - Wrap(CFN5) => count += 1, - Wrap(_) => {} - }; - - // Check that fn(&T) is structural-match when T is too. - const CFN6: Wrap<fn(&SM)> = Wrap(r_sm_to); - let input: Wrap<fn(&SM)> = Wrap(r_sm_to); - match Wrap(input) { - Wrap(CFN6) => count += 1, - Wrap(_) => {} - }; - - // Check that fn() -> &T is structural-match when T is too. - const CFN7: Wrap<fn(&()) -> &SM> = Wrap(r_to_r_sm); - let input: Wrap<fn(&()) -> &SM> = Wrap(r_to_r_sm); - match Wrap(input) { - Wrap(CFN7) => count += 1, - Wrap(_) => {} - }; - - // Check that fn(T) is structural-match even if T is not. - const CFN8: Wrap<fn(&NotSM)> = Wrap(r_not_sm_to); - let input: Wrap<fn(&NotSM)> = Wrap(r_not_sm_to); - match Wrap(input) { - Wrap(CFN8) => count += 1, - Wrap(_) => {} - }; - - // Check that fn() -> T is structural-match even if T is not. - const CFN9: Wrap<fn(&()) -> &NotSM> = Wrap(r_to_r_not_sm); - let input: Wrap<fn(&()) -> &NotSM> = Wrap(r_to_r_not_sm); - match Wrap(input) { - Wrap(CFN9) => count += 1, - Wrap(_) => {} - }; - - // Check that a type which has fn ptrs is structural-match. - #[derive(PartialEq, Eq)] - struct Foo { - alpha: fn(NotSM), - beta: fn() -> NotSM, - gamma: fn(SM), - delta: fn() -> SM, - } - - const CFOO: Foo = Foo { - alpha: not_sm_to, - beta: to_not_sm, - gamma: sm_to, - delta: to_sm, - }; - - let input = Foo { alpha: not_sm_to, beta: to_not_sm, gamma: sm_to, delta: to_sm }; - match input { - CFOO => count += 1, - Foo { .. } => {} - }; - - // Final count must be 10 now if all - assert_eq!(count, 10); -} |