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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.
54 lines
1.7 KiB
Plaintext
54 lines
1.7 KiB
Plaintext
error[E0433]: failed to resolve: could not find `doesnt_exist` in `inner`
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--> $DIR/diagnostics-cross-crate.rs:18:23
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LL | cfged_out::inner::doesnt_exist::hello();
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| ^^^^^^^^^^^^ could not find `doesnt_exist` in `inner`
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error[E0425]: cannot find function `uwu` in crate `cfged_out`
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--> $DIR/diagnostics-cross-crate.rs:7:16
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LL | cfged_out::uwu();
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| ^^^ not found in `cfged_out`
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error[E0425]: cannot find function `uwu` in module `cfged_out::inner`
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--> $DIR/diagnostics-cross-crate.rs:11:23
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LL | cfged_out::inner::uwu();
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| ^^^ not found in `cfged_out::inner`
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note: found an item that was configured out
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--> $DIR/auxiliary/cfged_out.rs:3:12
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LL | pub fn uwu() {}
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| ^^^
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error[E0425]: cannot find function `meow` in module `cfged_out::inner::right`
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--> $DIR/diagnostics-cross-crate.rs:22:30
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LL | cfged_out::inner::right::meow();
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| ^^^^ not found in `cfged_out::inner::right`
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note: found an item that was configured out
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--> $DIR/auxiliary/cfged_out.rs:17:16
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LL | pub fn meow() {}
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| ^^^^
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= note: the item is gated behind the `what-a-cool-feature` feature
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error[E0425]: cannot find function `vanished` in crate `cfged_out`
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--> $DIR/diagnostics-cross-crate.rs:28:16
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LL | cfged_out::vanished();
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| ^^^^^^^^ not found in `cfged_out`
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note: found an item that was configured out
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--> $DIR/auxiliary/cfged_out.rs:22:8
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LL | pub fn vanished() {}
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| ^^^^^^^^
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0425, E0433.
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For more information about an error, try `rustc --explain E0425`.
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