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Fully rework the algorithm and its explanation

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This commit is contained in:
Nadrieril 2023-10-23 08:19:10 +02:00
parent d744aecabf
commit cc6936d577
4 changed files with 857 additions and 740 deletions
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5
tests/ui/pattern/usefulness/integer-ranges/reachability.rs
View file

@ -9,9 +9,10 @@ macro_rules! m {
$t2 => {}
_ => {}
}
}
};
}
#[rustfmt::skip]
fn main() {
m!(0u8, 42, 41);
m!(0u8, 42, 42); //~ ERROR unreachable pattern
@ -85,7 +86,7 @@ fn main() {
match 'a' {
'\u{0}'..='\u{D7FF}' => {},
'\u{E000}'..='\u{10_FFFF}' => {},
'\u{D7FF}'..='\u{E000}' => {}, // FIXME should be unreachable
'\u{D7FF}'..='\u{E000}' => {}, //~ ERROR unreachable pattern
}
match (0u8, true) {

56
tests/ui/pattern/usefulness/integer-ranges/reachability.stderr
View file

@ -1,5 +1,5 @@
error: unreachable pattern
--> $DIR/reachability.rs:17:17
--> $DIR/reachability.rs:18:17
|
LL | m!(0u8, 42, 42);
| ^^
@ -11,127 +11,127 @@ LL | #![deny(unreachable_patterns)]
| ^^^^^^^^^^^^^^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:21:22
--> $DIR/reachability.rs:22:22
|
LL | m!(0u8, 20..=30, 20);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:22:22
--> $DIR/reachability.rs:23:22
|
LL | m!(0u8, 20..=30, 21);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:23:22
--> $DIR/reachability.rs:24:22
|
LL | m!(0u8, 20..=30, 25);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:24:22
--> $DIR/reachability.rs:25:22
|
LL | m!(0u8, 20..=30, 29);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:25:22
--> $DIR/reachability.rs:26:22
|
LL | m!(0u8, 20..=30, 30);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:28:21
--> $DIR/reachability.rs:29:21
|
LL | m!(0u8, 20..30, 20);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:29:21
--> $DIR/reachability.rs:30:21
|
LL | m!(0u8, 20..30, 21);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:30:21
--> $DIR/reachability.rs:31:21
|
LL | m!(0u8, 20..30, 25);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:31:21
--> $DIR/reachability.rs:32:21
|
LL | m!(0u8, 20..30, 29);
| ^^
error: unreachable pattern
--> $DIR/reachability.rs:35:22
--> $DIR/reachability.rs:36:22
|
LL | m!(0u8, 20..=30, 20..=30);
| ^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:36:22
--> $DIR/reachability.rs:37:22
|
LL | m!(0u8, 20.. 30, 20.. 30);
| ^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:37:22
--> $DIR/reachability.rs:38:22
|
LL | m!(0u8, 20..=30, 20.. 30);
| ^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:39:22
--> $DIR/reachability.rs:40:22
|
LL | m!(0u8, 20..=30, 21..=30);
| ^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:40:22
--> $DIR/reachability.rs:41:22
|
LL | m!(0u8, 20..=30, 20..=29);
| ^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:42:24
--> $DIR/reachability.rs:43:24
|
LL | m!('a', 'A'..='z', 'a'..='z');
| ^^^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:49:9
--> $DIR/reachability.rs:50:9
|
LL | 5..=8 => {},
| ^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:55:9
--> $DIR/reachability.rs:56:9
|
LL | 5..15 => {},
| ^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:62:9
--> $DIR/reachability.rs:63:9
|
LL | 5..25 => {},
| ^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:70:9
--> $DIR/reachability.rs:71:9
|
LL | 5..25 => {},
| ^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:76:9
--> $DIR/reachability.rs:77:9
|
LL | 5..15 => {},
| ^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:83:9
--> $DIR/reachability.rs:84:9
|
LL | _ => {},
| - matches any value
@ -139,16 +139,22 @@ LL | '\u{D7FF}'..='\u{E000}' => {},
| ^^^^^^^^^^^^^^^^^^^^^^^ unreachable pattern
error: unreachable pattern
--> $DIR/reachability.rs:104:9
--> $DIR/reachability.rs:89:9
|
LL | '\u{D7FF}'..='\u{E000}' => {},
| ^^^^^^^^^^^^^^^^^^^^^^^
error: unreachable pattern
--> $DIR/reachability.rs:105:9
|
LL | &FOO => {}
| ^^^^
error: unreachable pattern
--> $DIR/reachability.rs:105:9
--> $DIR/reachability.rs:106:9
|
LL | BAR => {}
| ^^^
error: aborting due to 24 previous errors
error: aborting due to 25 previous errors