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Add a note with a link to explain empty types

This commit is contained in:
Nadrieril 2024-08-19 21:08:18 +02:00
parent 25964b541e
commit efb28bdd90
18 changed files with 171 additions and 17 deletions
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1
compiler/rustc_mir_build/messages.ftl
View File

@ -332,6 +332,7 @@ mir_build_unreachable_matches_same_values = matches some of the same values
mir_build_unreachable_pattern = unreachable pattern
.label = no value can reach this
.unreachable_matches_no_values = matches no values because `{$ty}` is uninhabited
.unreachable_uninhabited_note = to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
.unreachable_covered_by_catchall = matches any value
.unreachable_covered_by_one = matches all the relevant values
.unreachable_covered_by_many = multiple earlier patterns match some of the same values

2
compiler/rustc_mir_build/src/errors.rs
View File

@ -588,6 +588,8 @@ pub(crate) struct UnreachablePattern<'tcx> {
pub(crate) span: Option<Span>,
#[subdiagnostic]
pub(crate) matches_no_values: Option<UnreachableMatchesNoValues<'tcx>>,
#[note(mir_build_unreachable_uninhabited_note)]
pub(crate) uninhabited_note: Option<()>,
#[label(mir_build_unreachable_covered_by_catchall)]
pub(crate) covered_by_catchall: Option<Span>,
#[label(mir_build_unreachable_covered_by_one)]

2
compiler/rustc_mir_build/src/thir/pattern/check_match.rs
View File

@ -921,6 +921,7 @@ fn report_unreachable_pattern<'p, 'tcx>(
let mut lint = UnreachablePattern {
span: Some(pat_span),
matches_no_values: None,
uninhabited_note: None,
covered_by_catchall: None,
covered_by_one: None,
covered_by_many: None,
@ -929,6 +930,7 @@ fn report_unreachable_pattern<'p, 'tcx>(
[] => {
// Empty pattern; we report the uninhabited type that caused the emptiness.
lint.span = None; // Don't label the pattern itself
lint.uninhabited_note = Some(()); // Give a link about empty types
pat.walk(&mut |subpat| {
let ty = **subpat.ty();
if cx.is_uninhabited(ty) {

14
tests/ui/pattern/usefulness/empty-match-check-notes.exhaustive_patterns.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `EmptyEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/empty-match-check-notes.rs:7:9
|
@ -12,31 +13,34 @@ LL | #![deny(unreachable_patterns)]
| ^^^^^^^^^^^^^^^^^^^^
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:21:9
--> $DIR/empty-match-check-notes.rs:22:9
|
LL | _ if false => {}
| ^
|
= note: matches no values because `EmptyEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:29:9
--> $DIR/empty-match-check-notes.rs:31:9
|
LL | _ => {}
| ^
|
= note: matches no values because `EmptyForeignEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:33:9
--> $DIR/empty-match-check-notes.rs:36:9
|
LL | _ if false => {}
| ^
|
= note: matches no values because `EmptyForeignEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0005]: refutable pattern in local binding
--> $DIR/empty-match-check-notes.rs:39:9
--> $DIR/empty-match-check-notes.rs:43:9
|
LL | let None = *x;
| ^^^^ pattern `Some(_)` not covered
@ -51,7 +55,7 @@ LL | if let None = *x { todo!() };
| ++ +++++++++++
error[E0004]: non-exhaustive patterns: `0_u8..=u8::MAX` not covered
--> $DIR/empty-match-check-notes.rs:49:11
--> $DIR/empty-match-check-notes.rs:53:11
|
LL | match 0u8 {
| ^^^ pattern `0_u8..=u8::MAX` not covered

14
tests/ui/pattern/usefulness/empty-match-check-notes.normal.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `EmptyEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/empty-match-check-notes.rs:7:9
|
@ -12,31 +13,34 @@ LL | #![deny(unreachable_patterns)]
| ^^^^^^^^^^^^^^^^^^^^
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:21:9
--> $DIR/empty-match-check-notes.rs:22:9
|
LL | _ if false => {}
| ^
|
= note: matches no values because `EmptyEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:29:9
--> $DIR/empty-match-check-notes.rs:31:9
|
LL | _ => {}
| ^
|
= note: matches no values because `EmptyForeignEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-match-check-notes.rs:33:9
--> $DIR/empty-match-check-notes.rs:36:9
|
LL | _ if false => {}
| ^
|
= note: matches no values because `EmptyForeignEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0005]: refutable pattern in local binding
--> $DIR/empty-match-check-notes.rs:39:9
--> $DIR/empty-match-check-notes.rs:43:9
|
LL | let None = *x;
| ^^^^ pattern `Some(_)` not covered
@ -51,7 +55,7 @@ LL | if let None = *x { todo!() };
| ++ +++++++++++
error[E0004]: non-exhaustive patterns: `0_u8..=u8::MAX` not covered
--> $DIR/empty-match-check-notes.rs:49:11
--> $DIR/empty-match-check-notes.rs:53:11
|
LL | match 0u8 {
| ^^^ pattern `0_u8..=u8::MAX` not covered

4
tests/ui/pattern/usefulness/empty-match-check-notes.rs
View File

@ -16,10 +16,12 @@ fn empty_enum(x: EmptyEnum) {
match x {
_ => {} //~ ERROR unreachable pattern
//~^ NOTE matches no values
//~| NOTE to learn more about uninhabited types, see
}
match x {
_ if false => {} //~ ERROR unreachable pattern
//~^ NOTE matches no values
//~| NOTE to learn more about uninhabited types, see
}
}
@ -28,10 +30,12 @@ fn empty_foreign_enum(x: empty::EmptyForeignEnum) {
match x {
_ => {} //~ ERROR unreachable pattern
//~^ NOTE matches no values
//~| NOTE to learn more about uninhabited types, see
}
match x {
_ if false => {} //~ ERROR unreachable pattern
//~^ NOTE matches no values
//~| NOTE to learn more about uninhabited types, see
}
}

35
tests/ui/pattern/usefulness/empty-types.exhaustive_patterns.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/empty-types.rs:15:9
|
@ -18,6 +19,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `&!` is non-empty
--> $DIR/empty-types.rs:56:11
@ -41,6 +43,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(u32, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:76:9
@ -49,6 +52,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:79:9
@ -57,6 +61,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:83:9
@ -65,6 +70,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(_)` not covered
--> $DIR/empty-types.rs:87:11
@ -92,6 +98,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:99:9
@ -100,6 +107,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(1_u32..=u32::MAX)` not covered
--> $DIR/empty-types.rs:96:11
@ -140,6 +148,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:115:9
@ -148,6 +157,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:118:9
@ -156,6 +166,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:119:9
@ -164,6 +175,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:122:9
@ -172,6 +184,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:123:9
@ -180,6 +193,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:132:13
@ -188,6 +202,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:135:13
@ -196,6 +211,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:143:13
@ -204,6 +220,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:147:13
@ -220,6 +237,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:204:13
@ -228,6 +246,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:209:13
@ -236,6 +255,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:214:13
@ -244,6 +264,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:220:13
@ -252,6 +273,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:281:9
@ -260,6 +282,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:284:9
@ -268,6 +291,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:287:9
@ -276,6 +300,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:288:9
@ -284,6 +309,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `&[!]` is non-empty
--> $DIR/empty-types.rs:327:11
@ -347,6 +373,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:371:9
@ -355,6 +382,7 @@ LL | [_, _, _] => {}
| ^^^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:374:9
@ -363,6 +391,7 @@ LL | [_, ..] => {}
| ^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:388:11
@ -407,6 +436,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:421:9
@ -415,6 +445,7 @@ LL | Some(_a) => {}
| ^^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:426:9
@ -441,6 +472,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:606:9
@ -449,6 +481,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:609:9
@ -457,6 +490,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:612:9
@ -465,6 +499,7 @@ LL | _x if false => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: aborting due to 49 previous errors

35
tests/ui/pattern/usefulness/empty-types.never_pats.stderr
View File

@ -14,6 +14,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/empty-types.rs:15:9
|
@ -27,6 +28,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `&!` is non-empty
--> $DIR/empty-types.rs:56:11
@ -50,6 +52,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(u32, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:76:9
@ -58,6 +61,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:79:9
@ -66,6 +70,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:83:9
@ -74,6 +79,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(_)` not covered
--> $DIR/empty-types.rs:87:11
@ -101,6 +107,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:99:9
@ -109,6 +116,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(1_u32..=u32::MAX)` not covered
--> $DIR/empty-types.rs:96:11
@ -163,6 +171,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:115:9
@ -171,6 +180,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:118:9
@ -179,6 +189,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:119:9
@ -187,6 +198,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:122:9
@ -195,6 +207,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:123:9
@ -203,6 +216,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:132:13
@ -211,6 +225,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:135:13
@ -219,6 +234,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:143:13
@ -227,6 +243,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:147:13
@ -262,6 +279,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:204:13
@ -270,6 +288,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:209:13
@ -278,6 +297,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:214:13
@ -286,6 +306,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:220:13
@ -294,6 +315,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:281:9
@ -302,6 +324,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:284:9
@ -310,6 +333,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:287:9
@ -318,6 +342,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:288:9
@ -326,6 +351,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0005]: refutable pattern in local binding
--> $DIR/empty-types.rs:297:13
@ -481,6 +507,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:371:9
@ -489,6 +516,7 @@ LL | [_, _, _] => {}
| ^^^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:374:9
@ -497,6 +525,7 @@ LL | [_, ..] => {}
| ^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:388:11
@ -541,6 +570,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:421:9
@ -549,6 +579,7 @@ LL | Some(_a) => {}
| ^^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:426:9
@ -665,6 +696,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:606:9
@ -673,6 +705,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:609:9
@ -681,6 +714,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:612:9
@ -689,6 +723,7 @@ LL | _x if false => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `&!` not covered
--> $DIR/empty-types.rs:637:11

35
tests/ui/pattern/usefulness/empty-types.normal.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/empty-types.rs:15:9
|
@ -18,6 +19,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `&!` is non-empty
--> $DIR/empty-types.rs:56:11
@ -41,6 +43,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(u32, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:76:9
@ -49,6 +52,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:79:9
@ -57,6 +61,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:83:9
@ -65,6 +70,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(_)` not covered
--> $DIR/empty-types.rs:87:11
@ -92,6 +98,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:99:9
@ -100,6 +107,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `Ok(1_u32..=u32::MAX)` not covered
--> $DIR/empty-types.rs:96:11
@ -154,6 +162,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:115:9
@ -162,6 +171,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:118:9
@ -170,6 +180,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:119:9
@ -178,6 +189,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:122:9
@ -186,6 +198,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:123:9
@ -194,6 +207,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:132:13
@ -202,6 +216,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:135:13
@ -210,6 +225,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:143:13
@ -218,6 +234,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:147:13
@ -253,6 +270,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:204:13
@ -261,6 +279,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:209:13
@ -269,6 +288,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:214:13
@ -277,6 +297,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:220:13
@ -285,6 +306,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:281:9
@ -293,6 +315,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:284:9
@ -301,6 +324,7 @@ LL | (_, _) => {}
| ^^^^^^
|
= note: matches no values because `(!, !)` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:287:9
@ -309,6 +333,7 @@ LL | Ok(_) => {}
| ^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:288:9
@ -317,6 +342,7 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `Result<!, !>` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0005]: refutable pattern in local binding
--> $DIR/empty-types.rs:297:13
@ -472,6 +498,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:371:9
@ -480,6 +507,7 @@ LL | [_, _, _] => {}
| ^^^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:374:9
@ -488,6 +516,7 @@ LL | [_, ..] => {}
| ^^^^^^^
|
= note: matches no values because `[!; 3]` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `[!; 0]` is non-empty
--> $DIR/empty-types.rs:388:11
@ -532,6 +561,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:421:9
@ -540,6 +570,7 @@ LL | Some(_a) => {}
| ^^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:426:9
@ -656,6 +687,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:606:9
@ -664,6 +696,7 @@ LL | _x => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:609:9
@ -672,6 +705,7 @@ LL | _ if false => {}
| ^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/empty-types.rs:612:9
@ -680,6 +714,7 @@ LL | _x if false => {}
| ^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: `&_` not covered
--> $DIR/empty-types.rs:637:11

3
tests/ui/pattern/usefulness/explain-unreachable-pats.rs
View File

@ -32,6 +32,7 @@ fn main() {
Err(_) => {}
//~^ ERROR unreachable pattern
//~| NOTE matches no values because `!` is uninhabited
//~| NOTE to learn more about uninhabited types, see
}
#[derive(Copy, Clone)]
@ -45,12 +46,14 @@ fn main() {
(Err(_), Err(_)) => {}
//~^ ERROR unreachable pattern
//~| NOTE matches no values because `Void2` is uninhabited
//~| NOTE to learn more about uninhabited types, see
_ => {}
}
match (res1, &res2) {
(Err(_), Err(_)) => {}
//~^ ERROR unreachable pattern
//~| NOTE matches no values because `Void1` is uninhabited
//~| NOTE to learn more about uninhabited types, see
_ => {}
}

17
tests/ui/pattern/usefulness/explain-unreachable-pats.stderr
View File

@ -38,25 +38,28 @@ LL | Err(_) => {}
| ^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:45:9
--> $DIR/explain-unreachable-pats.rs:46:9
|
LL | (Err(_), Err(_)) => {}
| ^^^^^^^^^^^^^^^^
|
= note: matches no values because `Void2` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:51:9
--> $DIR/explain-unreachable-pats.rs:53:9
|
LL | (Err(_), Err(_)) => {}
| ^^^^^^^^^^^^^^^^
|
= note: matches no values because `Void1` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:60:11
--> $DIR/explain-unreachable-pats.rs:63:11
|
LL | if let (0
| - matches all the relevant values
@ -65,13 +68,13 @@ LL | | 0, _) = (0, 0) {}
| ^ no value can reach this
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:70:9
--> $DIR/explain-unreachable-pats.rs:73:9
|
LL | (_, true) => {}
| ^^^^^^^^^ no value can reach this
|
note: multiple earlier patterns match some of the same values
--> $DIR/explain-unreachable-pats.rs:70:9
--> $DIR/explain-unreachable-pats.rs:73:9
|
LL | (true, _) => {}
| --------- matches some of the same values
@ -83,7 +86,7 @@ LL | (_, true) => {}
| ^^^^^^^^^ collectively making this unreachable
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:83:9
--> $DIR/explain-unreachable-pats.rs:86:9
|
LL | (true, _) => {}
| --------- matches all the relevant values
@ -92,7 +95,7 @@ LL | (true, true) => {}
| ^^^^^^^^^^^^ no value can reach this
error: unreachable pattern
--> $DIR/explain-unreachable-pats.rs:95:9
--> $DIR/explain-unreachable-pats.rs:98:9
|
LL | (_, true, 0..10) => {}
| ---------------- matches all the relevant values

8
tests/ui/pattern/usefulness/impl-trait.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/impl-trait.rs:4:9
|
@ -18,6 +19,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:44:13
@ -26,6 +28,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:48:13
@ -42,6 +45,7 @@ LL | Some(_) => {}
| ^^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:62:13
@ -58,6 +62,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:85:9
@ -74,6 +79,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:104:9
@ -98,6 +104,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `SecretelyVoid` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/impl-trait.rs:150:13
@ -106,6 +113,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `SecretelyDoubleVoid` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error[E0004]: non-exhaustive patterns: type `impl Copy` is non-empty
--> $DIR/impl-trait.rs:22:11

1
tests/ui/reachable/unreachable-loop-patterns.stderr
View File

@ -5,6 +5,7 @@ LL | for _ in unimplemented!() as Void {}
| ^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/unreachable-loop-patterns.rs:3:9
|

2
tests/ui/reachable/unreachable-try-pattern.stderr
View File

@ -20,6 +20,7 @@ LL | let y = (match x { Ok(n) => Ok(n as u32), Err(e) => Err(e) })?;
| ^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/unreachable-try-pattern.rs:4:9
|
@ -33,6 +34,7 @@ LL | let y = (match x { Ok(n) => Ok(n), Err(e) => Err(e) })?;
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
warning: 3 warnings emitted

6
tests/ui/rfcs/rfc-0000-never_patterns/unreachable.stderr
View File

@ -5,6 +5,7 @@ LL | Err(!),
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/unreachable.rs:4:9
|
@ -18,6 +19,7 @@ LL | let (Ok(_x) | Err(!)) = res_void;
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/unreachable.rs:19:12
@ -26,6 +28,7 @@ LL | if let Err(!) = res_void {}
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/unreachable.rs:21:24
@ -34,6 +37,7 @@ LL | if let (Ok(true) | Err(!)) = res_void {}
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/unreachable.rs:23:23
@ -42,6 +46,7 @@ LL | for (Ok(mut _x) | Err(!)) in [res_void] {}
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/unreachable.rs:27:18
@ -50,6 +55,7 @@ LL | fn foo((Ok(_x) | Err(!)): Result<bool, Void>) {}
| ^^^^^^
|
= note: matches no values because `Void` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: aborting due to 6 previous errors

1
tests/ui/rfcs/rfc-2008-non-exhaustive/enum_same_crate_empty_match.stderr
View File

@ -5,6 +5,7 @@ LL | _ => {}
| ^
|
= note: matches no values because `EmptyNonExhaustiveEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/enum_same_crate_empty_match.rs:1:9
|

5
tests/ui/rfcs/rfc-2008-non-exhaustive/uninhabited/patterns_same_crate.stderr
View File

@ -5,6 +5,7 @@ LL | Some(_x) => (),
| ^^^^^^^^
|
= note: matches no values because `UninhabitedEnum` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/patterns_same_crate.rs:1:9
|
@ -18,6 +19,7 @@ LL | Some(_x) => (),
| ^^^^^^^^
|
= note: matches no values because `UninhabitedVariants` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/patterns_same_crate.rs:60:15
@ -26,6 +28,7 @@ LL | while let PartiallyInhabitedVariants::Struct { x } = partially_inhabite
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: matches no values because `!` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/patterns_same_crate.rs:64:15
@ -34,6 +37,7 @@ LL | while let Some(_x) = uninhabited_struct() {
| ^^^^^^^^
|
= note: matches no values because `UninhabitedStruct` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/patterns_same_crate.rs:67:15
@ -42,6 +46,7 @@ LL | while let Some(_x) = uninhabited_tuple_struct() {
| ^^^^^^^^
|
= note: matches no values because `UninhabitedTupleStruct` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: aborting due to 5 previous errors

3
tests/ui/uninhabited/uninhabited-patterns.stderr
View File

@ -5,6 +5,7 @@ LL | Ok(box _) => (),
| ^^^^^^^^^
|
= note: matches no values because `NotSoSecretlyEmpty` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
note: the lint level is defined here
--> $DIR/uninhabited-patterns.rs:3:9
|
@ -18,6 +19,7 @@ LL | Err(Ok(_y)) => (),
| ^^^^^^^^^^^
|
= note: matches no values because `NotSoSecretlyEmpty` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: unreachable pattern
--> $DIR/uninhabited-patterns.rs:41:15
@ -26,6 +28,7 @@ LL | while let Some(_y) = foo() {
| ^^^^^^^^
|
= note: matches no values because `NotSoSecretlyEmpty` is uninhabited
= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
error: aborting due to 3 previous errors