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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.
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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,20 @@ | ||
//! Definitions shared by macros / syntax extensions and e.g. `rustc_middle`. | ||
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use rustc_span::{def_id::DefId, symbol::Ident}; | ||
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use crate::MetaItem; | ||
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pub mod allocator; | ||
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#[derive(Debug, Clone, Encodable, Decodable, HashStable_Generic)] | ||
pub struct StrippedCfgItem<ModId = DefId> { | ||
pub parent_module: ModId, | ||
pub name: Ident, | ||
pub cfg: MetaItem, | ||
} | ||
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impl<ModId> StrippedCfgItem<ModId> { | ||
pub fn map_mod_id<New>(self, f: impl FnOnce(ModId) -> New) -> StrippedCfgItem<New> { | ||
StrippedCfgItem { parent_module: f(self.parent_module), name: self.name, cfg: self.cfg } | ||
} | ||
} |
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