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A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.Diagnostics: Confusing error or lint; hard to understand for new users.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
Description
use std::thread;
use std::sync::mpsc::channel;
fn main() {
let (tx, _rx) = channel();
thread::spawn(|| tx.send(()).unwrap());
}
Errors with:
<anon>:6:5: 6:18 error: the trait `core::marker::Sync` is not implemented for the type `core::cell::UnsafeCell<std::sync::mpsc::Flavor<()>>` [E0277]
<anon>:6 thread::spawn(|| tx.send(()).unwrap());
^~~~~~~~~~~~~
<anon>:6:5: 6:18 note: `core::cell::UnsafeCell<std::sync::mpsc::Flavor<()>>` cannot be shared between threads safely
<anon>:6 thread::spawn(|| tx.send(()).unwrap());
When the real solution here is to add the move
keyword to the closure, but the error message leaves everyone quite confused.
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A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.Diagnostics: Confusing error or lint; hard to understand for new users.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.