57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
//@ edition:2018
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//@ aux-build:test-macros.rs
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//@ aux-build:derive-helper-shadowing.rs
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#[macro_use]
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extern crate test_macros;
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#[macro_use]
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extern crate derive_helper_shadowing;
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use test_macros::empty_attr as empty_helper;
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macro_rules! gen_helper_use {
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() => {
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#[empty_helper] //~ ERROR cannot find attribute `empty_helper` in this scope
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struct W;
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}
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}
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#[empty_helper] //~ ERROR `empty_helper` is ambiguous
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//~| WARN derive helper attribute is used before it is introduced
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//~| WARN this was previously accepted
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#[derive(Empty)]
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struct S {
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#[empty_helper] // OK, no ambiguity, derive helpers have highest priority
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field: [u8; {
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use empty_helper; // OK, no ambiguity, derive helpers have highest priority
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#[empty_helper] // OK, no ambiguity, derive helpers have highest priority
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struct U;
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mod inner {
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// OK, no ambiguity, the non-helper attribute is not in scope here, only the helper.
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#[empty_helper]
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struct V;
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gen_helper_use!();
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#[derive(GenHelperUse)] //~ ERROR cannot find attribute `empty_helper` in this scope
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struct Owo;
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use empty_helper as renamed;
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#[renamed] //~ ERROR cannot use a derive helper attribute through an import
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struct Wow;
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}
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0
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}]
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}
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// OK, no ambiguity, only the non-helper attribute is in scope.
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#[empty_helper]
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struct Z;
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fn main() {
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let s = S { field: [] };
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}
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