This repository was archived by the owner on Aug 15, 2025. It is now read-only.
This repository was archived by the owner on Aug 15, 2025. It is now read-only.
Arc<str> can't be bincoded #527
Description
Arc<str> can't be bincoded with bincode 2. See code and error message below. Arc<&str> works though. Link to gist at bottom.
use std::sync::Arc;
use bincode;
fn main() {
let val: Arc<str> = std::sync::Arc::from("Example String");
let config = bincode::config::standard();
let encoded = bincode::encode_to_vec(val, config).unwrap();
for byte in encoded {
print!(" {byte:02x}");
}
println!();
}compiled on rustc 1.61.0-nightly (58f11791a 2022-03-17) on MacOS gives:
error[E0277]: the size for values of type `str` cannot be known at compilation time
--> minimal_example/src/main.rs:7:40
|
7 | let encoded = bincode::encode_to_vec(val, config).unwrap();
| ---------------------- ^^^ doesn't have a size known at compile-time
| |
| required by a bound introduced by this call
|
= help: the trait `Sized` is not implemented for `str`
= note: required because of the requirements on the impl of `Encode` for `Arc<str>`
note: required by a bound in `encode_to_vec`
--> /Users/nalp/.cargo/registry/src/github.com-1ecc6299db9ec823/bincode-2.0.0-rc.1/src/features/impl_alloc.rs:42:25
|
42 | pub fn encode_to_vec<E: enc::Encode, C: Config>(val: E, config: C) -> Result<Vec<u8>, EncodeError> {
| ^^^^^^^^^^^ required by this bound in `encode_to_vec`
https://gist.github.com/nalply/c29385f0046ca03ae0f3a687dfeb24d1