conlang: Remove "self" keyword

compiler/cl-ast/src/ast_visitor/fold.rs

@@ -210,7 +210,6 @@ pub trait Fold {
     fn fold_path_part(&mut self, p: PathPart) -> PathPart {
         match p {
             PathPart::SuperKw => PathPart::SuperKw,
-            PathPart::SelfKw => PathPart::SelfKw,
             PathPart::SelfTy => PathPart::SelfTy,
             PathPart::Ident(i) => PathPart::Ident(self.fold_sym(i)),
         }

compiler/cl-ast/src/ast_visitor/walk.rs

@@ -464,7 +464,6 @@ impl Walk for PathPart {
     fn children<'a, V: Visit<'a>>(&'a self, v: &mut V) {
         match self {
             PathPart::SuperKw => {}
-            PathPart::SelfKw => {}
             PathPart::SelfTy => {}
             PathPart::Ident(sym) => sym.visit_in(v),
         }