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warning: `#[derive]` does nothing on macro invocations
--> $DIR/issue-49934.rs:20:5
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LL | #[derive(Debug)]
| ^^^^^^^^^^^^^^^^
|
= note: this may become a hard error in a future release
warning: unused attribute
--> $DIR/issue-49934.rs:6:8
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LL | fn foo<#[derive(Debug)] T>() { //~ WARN unused attribute
| ^^^^^^^^^^^^^^^^
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note: lint level defined here
--> $DIR/issue-49934.rs:4:9
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LL | #![warn(unused_attributes)] //~ NOTE lint level defined here
| ^^^^^^^^^^^^^^^^^
warning: unused attribute
--> $DIR/issue-49934.rs:8:9
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LL | #[derive(Debug)] //~ WARN unused attribute
| ^^^^^^^^^^^^^^^^
warning: unused attribute
--> $DIR/issue-49934.rs:26:5
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LL | #[derive(Debug)] //~ WARN unused attribute
| ^^^^^^^^^^^^^^^^
warning: unused attribute
--> $DIR/issue-49934.rs:30:5
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LL | #[derive(Debug)] //~ WARN unused attribute
| ^^^^^^^^^^^^^^^^
warning: unused attribute
--> $DIR/issue-49934.rs:34:13
|
LL | let _ = #[derive(Debug)] "Hello, world!";
| ^^^^^^^^^^^^^^^^
warning: unused attribute
--> $DIR/issue-49934.rs:39:9
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LL | #[derive(Debug)] //~ WARN unused attribute
| ^^^^^^^^^^^^^^^^
|