tree ce6beee816f90f2a935a2defa8caf28cb72b7e09
parent 9932c4b753c113d83c1a862c45902ac0d737cd84
parent 230d0a3063fca4da9c67377d6bc357cd346f2656
author bors <bors@rust-lang.org> 1755603413 +0000
committer bors <bors@rust-lang.org> 1755603413 +0000

Auto merge of #142487 - estebank:serde-attr-5, r=petrochenkov

Detect missing `derive` on unresolved attribute even when not imported

When encountering unresolved attributes, ensure the proc-macros for every crate in scope are added to the `macro_map` so that typos and missing `derive`s are properly detected.

```
error: cannot find attribute `sede` in this scope
  --> $DIR/missing-derive-3.rs:20:7
   |
LL |     #[sede(untagged)]
   |       ^^^^
   |
help: the derive macros `Deserialize` and `Serialize` accept the similarly named `serde` attribute
   |
LL |     #[serde(untagged)]
   |         +

error: cannot find attribute `serde` in this scope
  --> $DIR/missing-derive-3.rs:14:7
   |
LL |     #[serde(untagged)]
   |       ^^^^^
   |
note: `serde` is imported here, but it is a crate, not an attribute
  --> $DIR/missing-derive-3.rs:4:1
   |
LL | extern crate serde;
   | ^^^^^^^^^^^^^^^^^^^
help: `serde` is an attribute that can be used by the derive macros `Deserialize` and `Serialize`, you might be missing a `derive` attribute
   |
LL + #[derive(Deserialize, Serialize)]
LL | enum B {
   |
```

Follow up to rust-lang/rust#134841. Fix rust-lang/rust#47608.