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55b6f649024b372af901b3412a6d36c4284ccf3d
rust/tests/ui/cfg/diagnostics-not-a-def.rs

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Remember names of `cfg`-ed out items to mention them in diagnostics `#[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.
2023-03-10 22:39:14 +01:00
pub mod inner {
pub fn i_am_here() {
#[cfg(feature = "another one that doesn't exist")]
loop {}
}
}
fn main() {
inner::i_am_here();
// ensure that nothing bad happens when we are checking for cfgs
inner::i_am_not(); //~ ERROR cannot find function
}
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