Comments (3)
Aaron1011
commented on May 24, 2024
3
All of these errors appear to be caused by the fact that #[derive] is now a normal attribute, and will therefore not be imported by default with #![no_core]. Adding use _core::prelude::v1::derive; to tests/no-core/lib.rs fixed all of the errors for me locally.
The "derive helper attribute is used before it is introduced" lint appears to be spurious. I suspect it's caused by the recovery code in rustc (which is based on checking for a literal 'derive' ident, ignoring resolution) running when #[derive] is not actually in scope.
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Aaron1011
commented on May 24, 2024
1
Opened rust-lang/rust#81871 to track the spurious legacy_derive_helpers lint
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taiki-e
commented on May 24, 2024
@Aaron1011 Thanks! I've confirmed that we can fix the problem by the way you mentioned.
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Related Issues (20)
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- Rust-Analyzer compatibility HOT 7
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- Leaked UB in enums HOT 10
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