Commits on Jun 1, 2023

1. 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.

   

   Noratrieb committed Jun 1, 2023
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