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only set non-ADT derive error once per attribute, not per trait
A slight eccentricity of this change is that now non-ADT-derive errors prevent derive-macro-not-found errors from surfacing (see changes to the gating-of-derive compile-fail tests). Resolves #43927.
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#![allow(dead_code)] | ||
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#![derive(Debug, PartialEq, Eq)] // should be an outer attribute! | ||
struct DerivedOn; | ||
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fn main() {} |
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error: `derive` may only be applied to structs, enums and unions | ||
--> $DIR/issue-43927-non-ADT-derive.rs:13:1 | ||
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13 | #![derive(Debug, PartialEq, Eq)] // should be an outer attribute! | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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error: aborting due to previous error | ||
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