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A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlA-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)C-bugCategory: This is a bug.Category: This is a bug.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
I tried this code:
trait Foo {}
impl PartialEq for dyn Foo {
fn eq (self: &'_ Self, _: &'_ Self) -> bool { false }
}
#[derive(PartialEq)]
struct Bar {
__: ::std::rc::Rc<dyn Foo>,
}
fn main () {}
I expected to see this happen:
A working PartialEq
derived implementation for Bar
.
Instead, this happened:
An error was thrown:
error[E0507]: cannot move out of `*__self_1_0` which is behind a shared reference
--> src/main.rs:9:5
|
9 | __: ::std::rc::Rc<dyn Foo>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ move occurs because `*__self_1_0` has type `Rc<dyn Foo>`, which does not implement the `Copy` trait
|
= note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to previous error
For more information about this error, try `rustc --explain E0507`.
error: could not compile `playground`
To learn more, run the command again with --verbose.
Meta
The bug is present on nightly and stable in the two versions I tried:
rustc --version --verbose
:
rustc 1.49.0-nightly (ffa2e7ae8 2020-10-24)
binary: rustc
commit-hash: ffa2e7ae8fbf9badc035740db949b9dae271c29f
commit-date: 2020-10-24
host: x86_64-pc-windows-msvc
release: 1.49.0-nightly
LLVM version: 11.0
rustc --version --verbose
:
rustc 1.46.0 (04488afe3 2020-08-24)
binary: rustc
commit-hash: 04488afe34512aa4c33566eb16d8c912a3ae04f9
commit-date: 2020-08-24
host: x86_64-pc-windows-msvc
release: 1.46.0
LLVM version: 10.0
Backtrace doesn't show anything different than the error.
Here is the reproducable code: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a4d7bd689ed0687e24533f956f7a5971
@danielhenrymantilla seemed interested in the issue.
alexmaco, ColonelThirtyTwo, dnut and GregoryConradwkordalski
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A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlA-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)C-bugCategory: This is a bug.Category: This is a bug.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.