Detect missing derive on unresolved attribute even when not imported
#142487
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```
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 {
|
```
rustbot
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estebank
commented
Jun 14, 2025
Comment on lines
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| /// Add every proc macro accessible from the current crate to the `macro_map` so diagnostics can | ||
| /// find them for suggestions. | ||
| pub(crate) fn register_macros_for_all_crates(&mut self) { | ||
| let def_ids = self.cstore().all_proc_macro_def_ids(); | ||
| for def_id in def_ids { | ||
| self.get_macro_by_def_id(def_id); | ||
| } | ||
| } |
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We should memoize this, but the Resolver doesn't use queries, so we should likely do that "manually" by adding a signal field to the Resolver to skip this logic after the first call.
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The job Click to see the possible cause of the failure (guessed by this bot) |
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r? compiler |
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When encountering unresolved attributes, ensure the proc-macros for every crate in scope are added to the
macro_mapso that typos and missingderives are properly detected.Follow up to #134841.