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55b4549602
Given the code
```rust
pub fn main() {
const y: i32 = 4;
let y: i32 = 3;
}
```
`y` in the let binding is actually interpreted as a constant pattern
and is not a new variable, causing confusing diagnostics about
refutable patterns in local binding.
This commit extends the note for type ascription as a constant pattern
to `AscribeUserType` patterns as well.
32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
error[E0005]: refutable pattern in local binding
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--> $DIR/issue-112269.rs:3:9
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LL | let x: i32 = 3;
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| ^
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| patterns `i32::MIN..=3_i32` and `5_i32..=i32::MAX` not covered
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| missing patterns are not covered because `x` is interpreted as a constant pattern, not a new variable
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| help: introduce a variable instead: `x_var`
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= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
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= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
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= note: the matched value is of type `i32`
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error[E0005]: refutable pattern in local binding
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--> $DIR/issue-112269.rs:7:9
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LL | let y = 4;
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| ^
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| patterns `i32::MIN..=2_i32` and `4_i32..=i32::MAX` not covered
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| missing patterns are not covered because `y` is interpreted as a constant pattern, not a new variable
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| help: introduce a variable instead: `y_var`
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= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
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= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
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= note: the matched value is of type `i32`
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0005`.
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