Lifting Generics from MethodSig to TraitItem and ImplItem since we want to support generics in each variant of TraitItem and ImplItem

src/libsyntax/ast.rs

@@ -1178,7 +1178,6 @@ pub struct MethodSig {
     pub constness: Spanned<Constness>,
     pub abi: Abi,
     pub decl: P<FnDecl>,
-    pub generics: Generics,
 }
 
 /// Represents an item declaration within a trait declaration,
@@ -1190,6 +1189,7 @@ pub struct TraitItem {
     pub id: NodeId,
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
+    pub generics: Generics,
     pub node: TraitItemKind,
     pub span: Span,
     /// See `Item::tokens` for what this is
@@ -1211,6 +1211,7 @@ pub struct ImplItem {
     pub vis: Visibility,
     pub defaultness: Defaultness,
     pub attrs: Vec<Attribute>,
+    pub generics: Generics,
     pub node: ImplItemKind,
     pub span: Span,
     /// See `Item::tokens` for what this is