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``` error: cannot find attribute `empty_helper` in this scope --> $DIR/derive-helper-legacy-limits.rs:17:3 | LL | #[empty_helper] | ^^^^^^^^^^^^ | help: `empty_helper` is an attribute that can be used by the derive macro `Empty`, you might be missing a `derive` attribute | LL + #[derive(Empty)] LL | struct S2; | ``` Look at proc-macro attributes when encountering unknown attribute ``` error: cannot find attribute `sede` in this scope --> src/main.rs:18:7 | 18 | #[sede(untagged)] | ^^^^ | help: the derive macros `Serialize` and `Deserialize` accept the similarly named `serde` attribute | 18 | #[serde(untagged)] | ~~~~~ error: cannot find attribute `serde` in this scope --> src/main.rs:12:7 | 12 | #[serde(untagged)] | ^^^^^ | = note: `serde` is in scope, but it is a crate, not an attribute help: `serde` is an attribute that can be used by the derive macros `Serialize` and `Deserialize`, you might be missing a `derive` attribute | 10 | #[derive(Serialize, Deserialize)] | ```
27 lines
698 B
Rust
27 lines
698 B
Rust
//@aux-build:serde.rs
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// derive macros imported but unused
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extern crate serde;
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use serde::{Serialize, Deserialize};
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#[serde(untagged)] //~ ERROR cannot find attribute `serde`
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enum A { //~ HELP `serde` is an attribute that can be used by the derive macros `Deserialize` and `Serialize`
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A,
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B,
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}
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enum B { //~ HELP `serde` is an attribute that can be used by the derive macros `Deserialize` and `Serialize`
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A,
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#[serde(untagged)] //~ ERROR cannot find attribute `serde`
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B,
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}
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enum C {
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A,
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#[sede(untagged)] //~ ERROR cannot find attribute `sede`
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B, //~^ HELP the derive macros `Deserialize` and `Serialize` accept the similarly named `serde` attribute
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}
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fn main() {}
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