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
..
lexer	Warn when an escaped newline skips multiple lines	2021-08-11 11:35:08 +02:00
parser	Remove box syntax from rustc_parse	2021-08-18 09:25:26 +02:00
lib.rs	Remove Session.used_attrs and move logic to CheckAttrVisitor	2021-08-21 13:27:27 -05:00
validate_attr.rs	ast: Remove some indirection layers from values in key-value attributes	2021-01-09 21:50:39 +03:00