Aaron Hill af46699f81 Remove Session.used_attrs and move logic to CheckAttrVisitor ... Instead of updating global state to mark attributes as used, we now explicitly emit a warning when an attribute is used in an unsupported position. As a side effect, we are to emit more detailed warning messages (instead of just a generic "unused" message). `Session.check_name` is removed, since its only purpose was to mark the attribute as used. All of the callers are modified to use `Attribute.has_name` Additionally, `AttributeType::AssumedUsed` is removed - an 'assumed used' attribute is implemented by simply not performing any checks in `CheckAttrVisitor` for a particular attribute. We no longer emit unused attribute warnings for the `#[rustc_dummy]` attribute - it's an internal attribute used for tests, so it doesn't mark sense to treat it as 'unused'. With this commit, a large source of global untracked state is removed.		2021-08-21 13:27:27 -05:00
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builtin.rs	Remove Session.used_attrs and move logic to CheckAttrVisitor	2021-08-21 13:27:27 -05:00
lib.rs	Revert accidental removal of attributes	2021-08-04 13:38:17 -04:00