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When writing a constant name incorrectly in a pattern, the pattern will be identified as a new binding. We look for consts in the current crate, consts that where imported in the current crate and for local `let` bindings in case someone got them confused with `const`s.
```
error: unreachable pattern
--> $DIR/const-with-typo-in-pattern-binding.rs:30:9
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LL | GOOOD => {}
| ----- matches any value
LL |
LL | _ => {}
| ^ no value can reach this
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help: you might have meant to pattern match against the value of similarly named constant `GOOD` instead of introducing a new catch-all binding
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LL | GOOD => {}
| ~~~~
```
Fix #132582.
46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
#![deny(unreachable_patterns)] //~ NOTE the lint level is defined here
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#![allow(non_snake_case, non_upper_case_globals)]
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mod x {
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pub use std::env::consts::ARCH;
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const X: i32 = 0; //~ NOTE there is a constant of the same name
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}
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fn main() {
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let input: i32 = 42;
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const god: i32 = 1;
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const GOOD: i32 = 1;
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const BAD: i32 = 2;
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let name: i32 = 42; //~ NOTE there is a binding of the same name
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match input {
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X => {} //~ NOTE matches any value
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_ => {} //~ ERROR unreachable pattern
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//~^ NOTE no value can reach this
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}
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match input {
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GOD => {} //~ HELP you might have meant to pattern match against the value of similarly named constant `god`
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//~^ NOTE matches any value
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_ => {} //~ ERROR unreachable pattern
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//~^ NOTE no value can reach this
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}
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match input {
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GOOOD => {} //~ HELP you might have meant to pattern match against the value of similarly named constant `GOOD`
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//~^ NOTE matches any value
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_ => {} //~ ERROR unreachable pattern
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//~^ NOTE no value can reach this
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}
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match input {
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name => {}
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//~^ NOTE matches any value
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_ => {} //~ ERROR unreachable pattern
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//~^ NOTE no value can reach this
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}
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match "" {
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ARCH => {} //~ HELP you might have meant to pattern match against the value of constant `ARCH`
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//~^ NOTE matches any value
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_ => {} //~ ERROR unreachable pattern
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//~^ NOTE no value can reach this
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}
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}
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