Define datastructures for #[cfg] attribute, move StrippedCfgItem

compiler/rustc_ast/src/expand/mod.rs

@@ -1,24 +1,7 @@
 //! Definitions shared by macros / syntax extensions and e.g. `rustc_middle`.
 
 use rustc_macros::{Decodable, Encodable, HashStable_Generic};
-use rustc_span::Ident;
-use rustc_span::def_id::DefId;
-
-use crate::MetaItem;
 
 pub mod allocator;
 pub mod autodiff_attrs;
 pub mod typetree;
-
-#[derive(Debug, Clone, Encodable, Decodable, HashStable_Generic)]
-pub struct StrippedCfgItem<ModId = DefId> {
-    pub parent_module: ModId,
-    pub ident: Ident,
-    pub cfg: MetaItem,
-}
-
-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), ident: self.ident, cfg: self.cfg }
-    }
-}