Rust errors / Types and traits
Rust compiler error · checked with rustc 1.99.0
Rust error E0529: expected an array or slice, found `f32`
What it meansAn array or slice pattern was matched against some other type.
What rustc prints
error[E0529]: expected an array or slice, found `f32`
--> main.rs:5:5
|
5 | [a, b] => { // error: expected an array or slice, found `f32`
| ^^^^^^ pattern cannot match with input type `f32`Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0529Types and traits
Activein rustc 1.99.0
8related errors linked below
The compiler team's explanation
An array or slice pattern was matched against some other type.
Example of erroneous code:
let r: f32 = 1.0;
match r {
[a, b] => { // error: expected an array or slice, found `f32`
println!("a={}, b={}", a, b);
}
}Ensure that the pattern and the expression being matched on are of consistent types:
let r = [1.0, 2.0];
match r {
[a, b] => { // ok!
println!("a={}, b={}", a, b);
}
}From rustc --explain E0529 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
Related errors
- E0308mismatched types
- E0277the trait bound is not satisfied
- E0599no method named X found in the current scope
- E0433failed to resolve
- E0520`fly` specializes an item from a parent `impl`, but that item is not marked `default`
- E0525expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
- E0531cannot find tuple struct or tuple variant `Type` in this scope
- E0561patterns aren't allowed in function pointer types
Up next
Often hit nextE0308: mismatched typesA related error from the same family.Read it next →Did this answer your question?