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Remove a no-longer-true assert

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This commit is contained in:
Nadrieril 2024-08-13 22:58:54 +02:00
parent 80eb5a8e91
commit 249a588cad
5 changed files with 138 additions and 99 deletions
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10
compiler/rustc_mir_build/src/thir/pattern/check_match.rs
View File

@ -702,10 +702,12 @@ impl<'p, 'tcx> MatchVisitor<'p, 'tcx> {
&& adt.is_enum()
&& let Constructor::Variant(variant_index) = witness_1.ctor()
{
let variant = adt.variant(*variant_index);
let inhabited = variant.inhabited_predicate(self.tcx, *adt).instantiate(self.tcx, args);
assert!(inhabited.apply(self.tcx, cx.param_env, cx.module));
!inhabited.apply_ignore_module(self.tcx, cx.param_env)
let variant_inhabited = adt
.variant(*variant_index)
.inhabited_predicate(self.tcx, *adt)
.instantiate(self.tcx, args);
variant_inhabited.apply(self.tcx, cx.param_env, cx.module)
&& !variant_inhabited.apply_ignore_module(self.tcx, cx.param_env)
} else {
false
};

44
tests/ui/pattern/usefulness/empty-types.exhaustive_patterns.stderr
View File

@ -254,7 +254,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:279:9
--> $DIR/empty-types.rs:281:9
|
LL | _ => {}
| ^
@ -262,7 +262,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:282:9
--> $DIR/empty-types.rs:284:9
|
LL | (_, _) => {}
| ^^^^^^
@ -270,7 +270,7 @@ LL | (_, _) => {}
= note: this pattern matches no values because `(!, !)` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:285:9
--> $DIR/empty-types.rs:287:9
|
LL | Ok(_) => {}
| ^^^^^
@ -278,7 +278,7 @@ LL | Ok(_) => {}
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:286:9
--> $DIR/empty-types.rs:288:9
|
LL | Err(_) => {}
| ^^^^^^
@ -286,7 +286,7 @@ LL | Err(_) => {}
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error[E0004]: non-exhaustive patterns: type `&[!]` is non-empty
--> $DIR/empty-types.rs:318:11
--> $DIR/empty-types.rs:327:11
|
LL | match slice_never {}
| ^^^^^^^^^^^
@ -300,7 +300,7 @@ LL + }
|
error[E0004]: non-exhaustive patterns: `&[]` not covered
--> $DIR/empty-types.rs:329:11
--> $DIR/empty-types.rs:338:11
|
LL | match slice_never {
| ^^^^^^^^^^^ pattern `&[]` not covered
@ -313,7 +313,7 @@ LL + &[] => todo!()
|
error[E0004]: non-exhaustive patterns: `&[]` not covered
--> $DIR/empty-types.rs:343:11
--> $DIR/empty-types.rs:352:11
|
LL | match slice_never {
| ^^^^^^^^^^^ pattern `&[]` not covered
@ -327,7 +327,7 @@ LL + &[] => todo!()
|
error[E0004]: non-exhaustive patterns: type `[!]` is non-empty
--> $DIR/empty-types.rs:350:11
--> $DIR/empty-types.rs:359:11
|
LL | match *slice_never {}
| ^^^^^^^^^^^^
@ -341,7 +341,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:359:9
--> $DIR/empty-types.rs:368:9
|
LL | _ => {}
| ^
@ -349,7 +349,7 @@ LL | _ => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:362:9
--> $DIR/empty-types.rs:371:9
|
LL | [_, _, _] => {}
| ^^^^^^^^^
@ -357,7 +357,7 @@ LL | [_, _, _] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:365:9
--> $DIR/empty-types.rs:374:9
|
LL | [_, ..] => {}
| ^^^^^^^
@ -365,7 +365,7 @@ LL | [_, ..] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:379:11
--> $DIR/empty-types.rs:388:11
|
LL | match array_0_never {}
| ^^^^^^^^^^^^^
@ -379,7 +379,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:386:9
--> $DIR/empty-types.rs:395:9
|
LL | [] => {}
| -- matches all the values already
@ -387,7 +387,7 @@ LL | _ => {}
| ^ unreachable pattern
error[E0004]: non-exhaustive patterns: `[]` not covered
--> $DIR/empty-types.rs:388:11
--> $DIR/empty-types.rs:397:11
|
LL | match array_0_never {
| ^^^^^^^^^^^^^ pattern `[]` not covered
@ -401,7 +401,7 @@ LL + [] => todo!()
|
error: unreachable pattern
--> $DIR/empty-types.rs:407:9
--> $DIR/empty-types.rs:416:9
|
LL | Some(_) => {}
| ^^^^^^^
@ -409,7 +409,7 @@ LL | Some(_) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:412:9
--> $DIR/empty-types.rs:421:9
|
LL | Some(_a) => {}
| ^^^^^^^^
@ -417,7 +417,7 @@ LL | Some(_a) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:417:9
--> $DIR/empty-types.rs:426:9
|
LL | None => {}
| ---- matches all the values already
@ -426,7 +426,7 @@ LL | _ => {}
| ^ unreachable pattern
error: unreachable pattern
--> $DIR/empty-types.rs:422:9
--> $DIR/empty-types.rs:431:9
|
LL | None => {}
| ---- matches all the values already
@ -435,7 +435,7 @@ LL | _a => {}
| ^^ unreachable pattern
error: unreachable pattern
--> $DIR/empty-types.rs:594:9
--> $DIR/empty-types.rs:603:9
|
LL | _ => {}
| ^
@ -443,7 +443,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:597:9
--> $DIR/empty-types.rs:606:9
|
LL | _x => {}
| ^^
@ -451,7 +451,7 @@ LL | _x => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:600:9
--> $DIR/empty-types.rs:609:9
|
LL | _ if false => {}
| ^
@ -459,7 +459,7 @@ LL | _ if false => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:603:9
--> $DIR/empty-types.rs:612:9
|
LL | _x if false => {}
| ^^

86
tests/ui/pattern/usefulness/empty-types.never_pats.stderr
View File

@ -296,7 +296,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:279:9
--> $DIR/empty-types.rs:281:9
|
LL | _ => {}
| ^
@ -304,7 +304,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:282:9
--> $DIR/empty-types.rs:284:9
|
LL | (_, _) => {}
| ^^^^^^
@ -312,7 +312,7 @@ LL | (_, _) => {}
= note: this pattern matches no values because `(!, !)` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:285:9
--> $DIR/empty-types.rs:287:9
|
LL | Ok(_) => {}
| ^^^^^
@ -320,15 +320,29 @@ LL | Ok(_) => {}
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:286:9
--> $DIR/empty-types.rs:288:9
|
LL | Err(_) => {}
| ^^^^^^
|
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error[E0005]: refutable pattern in local binding
--> $DIR/empty-types.rs:297:13
|
LL | let Ok(_) = *ptr_result_never_err;
| ^^^^^ pattern `Err(!)` not covered
|
= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
= note: the matched value is of type `Result<u8, !>`
help: you might want to use `if let` to ignore the variant that isn't matched
|
LL | if let Ok(_) = *ptr_result_never_err { todo!() };
| ++ +++++++++++
error[E0004]: non-exhaustive patterns: type `(u32, !)` is non-empty
--> $DIR/empty-types.rs:307:11
--> $DIR/empty-types.rs:316:11
|
LL | match *x {}
| ^^
@ -342,7 +356,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `(!, !)` is non-empty
--> $DIR/empty-types.rs:309:11
--> $DIR/empty-types.rs:318:11
|
LL | match *x {}
| ^^
@ -356,7 +370,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: `Ok(!)` and `Err(!)` not covered
--> $DIR/empty-types.rs:311:11
--> $DIR/empty-types.rs:320:11
|
LL | match *x {}
| ^^ patterns `Ok(!)` and `Err(!)` not covered
@ -378,7 +392,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `[!; 3]` is non-empty
--> $DIR/empty-types.rs:313:11
--> $DIR/empty-types.rs:322:11
|
LL | match *x {}
| ^^
@ -392,7 +406,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `&[!]` is non-empty
--> $DIR/empty-types.rs:318:11
--> $DIR/empty-types.rs:327:11
|
LL | match slice_never {}
| ^^^^^^^^^^^
@ -406,7 +420,7 @@ LL + }
|
error[E0004]: non-exhaustive patterns: `&[!, ..]` not covered
--> $DIR/empty-types.rs:320:11
--> $DIR/empty-types.rs:329:11
|
LL | match slice_never {
| ^^^^^^^^^^^ pattern `&[!, ..]` not covered
@ -420,7 +434,7 @@ LL + &[!, ..]
|
error[E0004]: non-exhaustive patterns: `&[]`, `&[!]` and `&[!, !]` not covered
--> $DIR/empty-types.rs:329:11
--> $DIR/empty-types.rs:338:11
|
LL | match slice_never {
| ^^^^^^^^^^^ patterns `&[]`, `&[!]` and `&[!, !]` not covered
@ -433,7 +447,7 @@ LL + &[] | &[!] | &[!, !] => todo!()
|
error[E0004]: non-exhaustive patterns: `&[]` and `&[!, ..]` not covered
--> $DIR/empty-types.rs:343:11
--> $DIR/empty-types.rs:352:11
|
LL | match slice_never {
| ^^^^^^^^^^^ patterns `&[]` and `&[!, ..]` not covered
@ -447,7 +461,7 @@ LL + &[] | &[!, ..] => todo!()
|
error[E0004]: non-exhaustive patterns: type `[!]` is non-empty
--> $DIR/empty-types.rs:350:11
--> $DIR/empty-types.rs:359:11
|
LL | match *slice_never {}
| ^^^^^^^^^^^^
@ -461,7 +475,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:359:9
--> $DIR/empty-types.rs:368:9
|
LL | _ => {}
| ^
@ -469,7 +483,7 @@ LL | _ => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:362:9
--> $DIR/empty-types.rs:371:9
|
LL | [_, _, _] => {}
| ^^^^^^^^^
@ -477,7 +491,7 @@ LL | [_, _, _] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:365:9
--> $DIR/empty-types.rs:374:9
|
LL | [_, ..] => {}
| ^^^^^^^
@ -485,7 +499,7 @@ LL | [_, ..] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:379:11
--> $DIR/empty-types.rs:388:11
|
LL | match array_0_never {}
| ^^^^^^^^^^^^^
@ -499,7 +513,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:386:9
--> $DIR/empty-types.rs:395:9
|
LL | [] => {}
| -- matches all the values already
@ -507,7 +521,7 @@ LL | _ => {}
| ^ unreachable pattern
error[E0004]: non-exhaustive patterns: `[]` not covered
--> $DIR/empty-types.rs:388:11
--> $DIR/empty-types.rs:397:11
|
LL | match array_0_never {
| ^^^^^^^^^^^^^ pattern `[]` not covered
@ -521,7 +535,7 @@ LL + [] => todo!()
|
error: unreachable pattern
--> $DIR/empty-types.rs:407:9
--> $DIR/empty-types.rs:416:9
|
LL | Some(_) => {}
| ^^^^^^^
@ -529,7 +543,7 @@ LL | Some(_) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:412:9
--> $DIR/empty-types.rs:421:9
|
LL | Some(_a) => {}
| ^^^^^^^^
@ -537,7 +551,7 @@ LL | Some(_a) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:417:9
--> $DIR/empty-types.rs:426:9
|
LL | None => {}
| ---- matches all the values already
@ -546,7 +560,7 @@ LL | _ => {}
| ^ unreachable pattern
error: unreachable pattern
--> $DIR/empty-types.rs:422:9
--> $DIR/empty-types.rs:431:9
|
LL | None => {}
| ---- matches all the values already
@ -555,7 +569,7 @@ LL | _a => {}
| ^^ unreachable pattern
error[E0004]: non-exhaustive patterns: `&Some(!)` not covered
--> $DIR/empty-types.rs:442:11
--> $DIR/empty-types.rs:451:11
|
LL | match ref_opt_never {
| ^^^^^^^^^^^^^ pattern `&Some(!)` not covered
@ -574,7 +588,7 @@ LL + &Some(!)
|
error[E0004]: non-exhaustive patterns: `Some(!)` not covered
--> $DIR/empty-types.rs:483:11
--> $DIR/empty-types.rs:492:11
|
LL | match *ref_opt_never {
| ^^^^^^^^^^^^^^ pattern `Some(!)` not covered
@ -593,7 +607,7 @@ LL + Some(!)
|
error[E0004]: non-exhaustive patterns: `Err(!)` not covered
--> $DIR/empty-types.rs:531:11
--> $DIR/empty-types.rs:540:11
|
LL | match *ref_res_never {
| ^^^^^^^^^^^^^^ pattern `Err(!)` not covered
@ -612,7 +626,7 @@ LL + Err(!)
|
error[E0004]: non-exhaustive patterns: `Err(!)` not covered
--> $DIR/empty-types.rs:542:11
--> $DIR/empty-types.rs:551:11
|
LL | match *ref_res_never {
| ^^^^^^^^^^^^^^ pattern `Err(!)` not covered
@ -631,7 +645,7 @@ LL + Err(!)
|
error[E0004]: non-exhaustive patterns: type `(u32, !)` is non-empty
--> $DIR/empty-types.rs:561:11
--> $DIR/empty-types.rs:570:11
|
LL | match *ref_tuple_half_never {}
| ^^^^^^^^^^^^^^^^^^^^^
@ -645,7 +659,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:594:9
--> $DIR/empty-types.rs:603:9
|
LL | _ => {}
| ^
@ -653,7 +667,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:597:9
--> $DIR/empty-types.rs:606:9
|
LL | _x => {}
| ^^
@ -661,7 +675,7 @@ LL | _x => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:600:9
--> $DIR/empty-types.rs:609:9
|
LL | _ if false => {}
| ^
@ -669,7 +683,7 @@ LL | _ if false => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:603:9
--> $DIR/empty-types.rs:612:9
|
LL | _x if false => {}
| ^^
@ -677,7 +691,7 @@ LL | _x if false => {}
= note: this pattern matches no values because `!` is uninhabited
error[E0004]: non-exhaustive patterns: `&!` not covered
--> $DIR/empty-types.rs:628:11
--> $DIR/empty-types.rs:637:11
|
LL | match ref_never {
| ^^^^^^^^^ pattern `&!` not covered
@ -693,7 +707,7 @@ LL + &!
|
error[E0004]: non-exhaustive patterns: `Ok(!)` not covered
--> $DIR/empty-types.rs:644:11
--> $DIR/empty-types.rs:653:11
|
LL | match *ref_result_never {
| ^^^^^^^^^^^^^^^^^ pattern `Ok(!)` not covered
@ -712,7 +726,7 @@ LL + Ok(!)
|
error[E0004]: non-exhaustive patterns: `Some(!)` not covered
--> $DIR/empty-types.rs:664:11
--> $DIR/empty-types.rs:673:11
|
LL | match *x {
| ^^ pattern `Some(!)` not covered
@ -730,7 +744,7 @@ LL ~ None => {},
LL + Some(!)
|
error: aborting due to 64 previous errors; 1 warning emitted
error: aborting due to 65 previous errors; 1 warning emitted
Some errors have detailed explanations: E0004, E0005.
For more information about an error, try `rustc --explain E0004`.

86
tests/ui/pattern/usefulness/empty-types.normal.stderr
View File

@ -287,7 +287,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:279:9
--> $DIR/empty-types.rs:281:9
|
LL | _ => {}
| ^
@ -295,7 +295,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:282:9
--> $DIR/empty-types.rs:284:9
|
LL | (_, _) => {}
| ^^^^^^
@ -303,7 +303,7 @@ LL | (_, _) => {}
= note: this pattern matches no values because `(!, !)` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:285:9
--> $DIR/empty-types.rs:287:9
|
LL | Ok(_) => {}
| ^^^^^
@ -311,15 +311,29 @@ LL | Ok(_) => {}
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:286:9
--> $DIR/empty-types.rs:288:9
|
LL | Err(_) => {}
| ^^^^^^
|
= note: this pattern matches no values because `Result<!, !>` is uninhabited
error[E0005]: refutable pattern in local binding
--> $DIR/empty-types.rs:297:13
|
LL | let Ok(_) = *ptr_result_never_err;
| ^^^^^ pattern `Err(_)` not covered
|
= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
= note: the matched value is of type `Result<u8, !>`
help: you might want to use `if let` to ignore the variant that isn't matched
|
LL | if let Ok(_) = *ptr_result_never_err { todo!() };
| ++ +++++++++++
error[E0004]: non-exhaustive patterns: type `(u32, !)` is non-empty
--> $DIR/empty-types.rs:307:11
--> $DIR/empty-types.rs:316:11
|
LL | match *x {}
| ^^
@ -333,7 +347,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `(!, !)` is non-empty
--> $DIR/empty-types.rs:309:11
--> $DIR/empty-types.rs:318:11
|
LL | match *x {}
| ^^
@ -347,7 +361,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: `Ok(_)` and `Err(_)` not covered
--> $DIR/empty-types.rs:311:11
--> $DIR/empty-types.rs:320:11
|
LL | match *x {}
| ^^ patterns `Ok(_)` and `Err(_)` not covered
@ -369,7 +383,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `[!; 3]` is non-empty
--> $DIR/empty-types.rs:313:11
--> $DIR/empty-types.rs:322:11
|
LL | match *x {}
| ^^
@ -383,7 +397,7 @@ LL ~ }
|
error[E0004]: non-exhaustive patterns: type `&[!]` is non-empty
--> $DIR/empty-types.rs:318:11
--> $DIR/empty-types.rs:327:11
|
LL | match slice_never {}
| ^^^^^^^^^^^
@ -397,7 +411,7 @@ LL + }
|
error[E0004]: non-exhaustive patterns: `&[_, ..]` not covered
--> $DIR/empty-types.rs:320:11
--> $DIR/empty-types.rs:329:11
|
LL | match slice_never {
| ^^^^^^^^^^^ pattern `&[_, ..]` not covered
@ -411,7 +425,7 @@ LL + &[_, ..] => todo!()
|
error[E0004]: non-exhaustive patterns: `&[]`, `&[_]` and `&[_, _]` not covered
--> $DIR/empty-types.rs:329:11
--> $DIR/empty-types.rs:338:11
|
LL | match slice_never {
| ^^^^^^^^^^^ patterns `&[]`, `&[_]` and `&[_, _]` not covered
@ -424,7 +438,7 @@ LL + &[] | &[_] | &[_, _] => todo!()
|
error[E0004]: non-exhaustive patterns: `&[]` and `&[_, ..]` not covered
--> $DIR/empty-types.rs:343:11
--> $DIR/empty-types.rs:352:11
|
LL | match slice_never {
| ^^^^^^^^^^^ patterns `&[]` and `&[_, ..]` not covered
@ -438,7 +452,7 @@ LL + &[] | &[_, ..] => todo!()
|
error[E0004]: non-exhaustive patterns: type `[!]` is non-empty
--> $DIR/empty-types.rs:350:11
--> $DIR/empty-types.rs:359:11
|
LL | match *slice_never {}
| ^^^^^^^^^^^^
@ -452,7 +466,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:359:9
--> $DIR/empty-types.rs:368:9
|
LL | _ => {}
| ^
@ -460,7 +474,7 @@ LL | _ => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:362:9
--> $DIR/empty-types.rs:371:9
|
LL | [_, _, _] => {}
| ^^^^^^^^^
@ -468,7 +482,7 @@ LL | [_, _, _] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:365:9
--> $DIR/empty-types.rs:374:9
|
LL | [_, ..] => {}
| ^^^^^^^
@ -476,7 +490,7 @@ LL | [_, ..] => {}
= note: this pattern matches no values because `[!; 3]` is uninhabited
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:379:11
--> $DIR/empty-types.rs:388:11
|
LL | match array_0_never {}
| ^^^^^^^^^^^^^
@ -490,7 +504,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:386:9
--> $DIR/empty-types.rs:395:9
|
LL | [] => {}
| -- matches all the values already
@ -498,7 +512,7 @@ LL | _ => {}
| ^ unreachable pattern
error[E0004]: non-exhaustive patterns: `[]` not covered
--> $DIR/empty-types.rs:388:11
--> $DIR/empty-types.rs:397:11
|
LL | match array_0_never {
| ^^^^^^^^^^^^^ pattern `[]` not covered
@ -512,7 +526,7 @@ LL + [] => todo!()
|
error: unreachable pattern
--> $DIR/empty-types.rs:407:9
--> $DIR/empty-types.rs:416:9
|
LL | Some(_) => {}
| ^^^^^^^
@ -520,7 +534,7 @@ LL | Some(_) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:412:9
--> $DIR/empty-types.rs:421:9
|
LL | Some(_a) => {}
| ^^^^^^^^
@ -528,7 +542,7 @@ LL | Some(_a) => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:417:9
--> $DIR/empty-types.rs:426:9
|
LL | None => {}
| ---- matches all the values already
@ -537,7 +551,7 @@ LL | _ => {}
| ^ unreachable pattern
error: unreachable pattern
--> $DIR/empty-types.rs:422:9
--> $DIR/empty-types.rs:431:9
|
LL | None => {}
| ---- matches all the values already
@ -546,7 +560,7 @@ LL | _a => {}
| ^^ unreachable pattern
error[E0004]: non-exhaustive patterns: `&Some(_)` not covered
--> $DIR/empty-types.rs:442:11
--> $DIR/empty-types.rs:451:11
|
LL | match ref_opt_never {
| ^^^^^^^^^^^^^ pattern `&Some(_)` not covered
@ -565,7 +579,7 @@ LL + &Some(_) => todo!()
|
error[E0004]: non-exhaustive patterns: `Some(_)` not covered
--> $DIR/empty-types.rs:483:11
--> $DIR/empty-types.rs:492:11
|
LL | match *ref_opt_never {
| ^^^^^^^^^^^^^^ pattern `Some(_)` not covered
@ -584,7 +598,7 @@ LL + Some(_) => todo!()
|
error[E0004]: non-exhaustive patterns: `Err(_)` not covered
--> $DIR/empty-types.rs:531:11
--> $DIR/empty-types.rs:540:11
|
LL | match *ref_res_never {
| ^^^^^^^^^^^^^^ pattern `Err(_)` not covered
@ -603,7 +617,7 @@ LL + Err(_) => todo!()
|
error[E0004]: non-exhaustive patterns: `Err(_)` not covered
--> $DIR/empty-types.rs:542:11
--> $DIR/empty-types.rs:551:11
|
LL | match *ref_res_never {
| ^^^^^^^^^^^^^^ pattern `Err(_)` not covered
@ -622,7 +636,7 @@ LL + Err(_) => todo!()
|
error[E0004]: non-exhaustive patterns: type `(u32, !)` is non-empty
--> $DIR/empty-types.rs:561:11
--> $DIR/empty-types.rs:570:11
|
LL | match *ref_tuple_half_never {}
| ^^^^^^^^^^^^^^^^^^^^^
@ -636,7 +650,7 @@ LL + }
|
error: unreachable pattern
--> $DIR/empty-types.rs:594:9
--> $DIR/empty-types.rs:603:9
|
LL | _ => {}
| ^
@ -644,7 +658,7 @@ LL | _ => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:597:9
--> $DIR/empty-types.rs:606:9
|
LL | _x => {}
| ^^
@ -652,7 +666,7 @@ LL | _x => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:600:9
--> $DIR/empty-types.rs:609:9
|
LL | _ if false => {}
| ^
@ -660,7 +674,7 @@ LL | _ if false => {}
= note: this pattern matches no values because `!` is uninhabited
error: unreachable pattern
--> $DIR/empty-types.rs:603:9
--> $DIR/empty-types.rs:612:9
|
LL | _x if false => {}
| ^^
@ -668,7 +682,7 @@ LL | _x if false => {}
= note: this pattern matches no values because `!` is uninhabited
error[E0004]: non-exhaustive patterns: `&_` not covered
--> $DIR/empty-types.rs:628:11
--> $DIR/empty-types.rs:637:11
|
LL | match ref_never {
| ^^^^^^^^^ pattern `&_` not covered
@ -684,7 +698,7 @@ LL + &_ => todo!()
|
error[E0004]: non-exhaustive patterns: `Ok(_)` not covered
--> $DIR/empty-types.rs:644:11
--> $DIR/empty-types.rs:653:11
|
LL | match *ref_result_never {
| ^^^^^^^^^^^^^^^^^ pattern `Ok(_)` not covered
@ -703,7 +717,7 @@ LL + Ok(_) => todo!()
|
error[E0004]: non-exhaustive patterns: `Some(_)` not covered
--> $DIR/empty-types.rs:664:11
--> $DIR/empty-types.rs:673:11
|
LL | match *x {
| ^^ pattern `Some(_)` not covered
@ -721,7 +735,7 @@ LL ~ None => {},
LL + Some(_) => todo!()
|
error: aborting due to 64 previous errors
error: aborting due to 65 previous errors
Some errors have detailed explanations: E0004, E0005.
For more information about an error, try `rustc --explain E0004`.

11
tests/ui/pattern/usefulness/empty-types.rs
View File

@ -17,7 +17,7 @@
#[derive(Copy, Clone)]
enum Void {}
/// A bunch of never situations that can't be normally constructed.
/// A bunch of never situations that can't be normally constructed so we take them as argument.
#[derive(Copy, Clone)]
struct NeverBundle {
never: !,
@ -272,6 +272,8 @@ fn nested_validity_tracking(bundle: NeverBundle) {
let ref_never: &! = &never;
let tuple_never: (!, !) = bundle.tuple_never;
let result_never: Result<!, !> = bundle.result_never;
let result_never_err: Result<u8, !> = Ok(0);
let ptr_result_never_err: *const Result<u8, !> = &result_never_err as *const _;
let union_never = Uninit::<!>::new();
// These should be considered known_valid and warn unreachable.
@ -287,6 +289,13 @@ fn nested_validity_tracking(bundle: NeverBundle) {
}
// These should be considered !known_valid and not warn unreachable.
unsafe {
match *ptr_result_never_err {
Ok(_) => {}
Err(_) => {}
}
let Ok(_) = *ptr_result_never_err; //[normal,never_pats]~ ERROR refutable pattern
}
match ref_never {
&_ => {}
}