Regression in type inference between stable 1.79.0 and nightly-2024-06-19 #126685
Description
Code
I tried this code in nightly:
pub fn parse(bytes: &[u8]) -> String { std::ffi::CStr::from_bytes_until_nul(bytes) .unwrap() .to_str() .unwrap() .split('\n') .map(str::trim_end) .collect::<Box<_>>() .join("\n") }I expected to see this happen: it compiles successfully
Instead, this happened:
error[E0282]: type annotations needed --> src/lib.rs:8:10 | 8 | .collect::<Box<_>>() | ^^^^^^^ cannot infer type of the type parameter `B` declared on the method `collect` 9 | .join("\n") | ---- type must be known at this point | help: consider specifying the generic argument | 8 | .collect::<Vec<_>>() | ~~~~~~~~~~ For more information about this error, try `rustc --explain E0282`. error: could not compile `playground` (lib) due to 1 previous error Version it worked on
It most recently worked on: Rust 1.79.0
Version with regression
nightly-2024-06-19