mirror of
https://github.com/rust-lang/rust
synced 2024-09-06 01:11:17 +00:00
46 lines
1 KiB
Rust
46 lines
1 KiB
Rust
//@ run-pass
|
|
//
|
|
// This is derived from a change to compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs, in
|
|
// preparation for adopting let-else within the compiler (thanks @est31):
|
|
//
|
|
// ```
|
|
// - let place = if let mir::VarDebugInfoContents::Place(p) = var.value { p } else { continue };
|
|
// + let mir::VarDebugInfoContents::Place(place) = var.value else { continue };
|
|
// ```
|
|
//
|
|
// The move was due to mir::Place being Copy, but mir::VarDebugInfoContents not being Copy.
|
|
|
|
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct Copyable;
|
|
|
|
enum NonCopy {
|
|
Thing(Copyable),
|
|
#[allow(unused)]
|
|
Other,
|
|
}
|
|
|
|
struct Wrapper {
|
|
field: NonCopy,
|
|
}
|
|
|
|
fn let_else() {
|
|
let vec = vec![Wrapper { field: NonCopy::Thing(Copyable) }];
|
|
for item in &vec {
|
|
let NonCopy::Thing(_copyable) = item.field else { continue };
|
|
}
|
|
}
|
|
|
|
fn if_let() {
|
|
let vec = vec![Wrapper { field: NonCopy::Thing(Copyable) }];
|
|
for item in &vec {
|
|
let _copyable = if let NonCopy::Thing(copyable) = item.field { copyable } else { continue };
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let_else();
|
|
if_let();
|
|
}
|