Closed
Description
Using the following flags
--force-warn clippy::exhaustive-structs
this code:
#![feature(default_field_values)]
pub struct A {
pub a: isize = 42,
}caused the following diagnostics:
Checking _struct_field_default v0.1.0 (/tmp/icemaker_global_tempdir.o4hDRjvshrmO/icemaker_clippyfix_tempdir.6eDmH3ibcMeG/_struct_field_default)
warning: exported structs should not be exhaustive
--> src/lib.rs:3:1
|
3 | / pub struct A {
4 | | pub a: isize = 42,
5 | | }
| |_^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#exhaustive_structs
= note: requested on the command line with `--force-warn clippy::exhaustive-structs`
help: try adding #[non_exhaustive]
|
3 + #[non_exhaustive]
4 | pub struct A {
|
warning: `_struct_field_default` (lib) generated 1 warning
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
However after applying these diagnostics, the resulting code:
#![feature(default_field_values)]
#[non_exhaustive]
pub struct A {
pub a: isize = 42,
}no longer compiled:
Checking _struct_field_default v0.1.0 (/tmp/icemaker_global_tempdir.o4hDRjvshrmO/icemaker_clippyfix_tempdir.6eDmH3ibcMeG/_struct_field_default)
error: `#[non_exhaustive]` can't be used to annotate items with default field values
--> src/lib.rs:3:1
|
3 | #[non_exhaustive]
| ^^^^^^^^^^^^^^^^^
4 | / pub struct A {
5 | | pub a: isize = 42,
6 | | }
| |_- this struct has default field values
error: could not compile `_struct_field_default` (lib test) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `_struct_field_default` (lib) due to 1 previous error
Version:
rustc 1.89.0-nightly (cf423712b 2025-06-05)
binary: rustc
commit-hash: cf423712b9e95e9f6ec84b1ecb3d125e55ac8d56
commit-date: 2025-06-05
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5