Module stability 

Re-exports

use rustc_attr_ir::AttrPath; 🔒

use rustc_feature::AttributeStability; 🔒

use rustc_session::diagnostics::feature_err; 🔒

use rustc_span::Span; 🔒

use rustc_span::sym; 🔒

use crate::AttributeParser; 🔒

use crate::ShouldEmit; 🔒