a647ba250a
`#[cfg]`s are frequently used to gate crate content behind cargo features. This can lead to very confusing errors when features are missing. For example, `serde` doesn't have the `derive` feature by default. Therefore, `serde::Serialize` fails to resolve with a generic error, even though the macro is present in the docs. This commit adds a list of all stripped item names to metadata. This is filled during macro expansion and then, through a fed query, persisted in metadata. The downstream resolver can then access the metadata to look at possible candidates for mentioning in the errors. This slightly increases metadata (800k->809k for the feature-heavy windows crate), but not enough to really matter.
17 lines
328 B
Rust
17 lines
328 B
Rust
pub mod inner {
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#[cfg(FALSE)]
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mod gone {
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pub fn uwu() {}
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}
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#[cfg(FALSE)]
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pub use super::uwu;
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//~^ NOTE found an item that was configured out
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}
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fn main() {
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// There is no uwu at this path - no diagnostic.
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inner::uwu(); //~ ERROR cannot find function
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//~^ NOTE not found in `inner`
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}
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