conlang: Remove "Identifier" node

It never carried any extra information, and got in the way everywhere it was used.

compiler/cl-parser/src/inliner.rs

@@ -64,8 +64,7 @@ impl Fold for ModuleInliner {
     /// Traverses down the module tree, entering ever nested directories
     fn fold_module(&mut self, m: Module) -> Module {
         let Module { name, kind } = m;
-        let sym = name.0;
-        self.path.push(&*sym); // cd ./name
+        self.path.push(&*name); // cd ./name
 
         let kind = self.fold_module_kind(kind);
 

compiler/cl-parser/src/parser.rs

@@ -769,8 +769,8 @@ impl<'t> Parser<'t> {
         self.consume_peeked();
         Ok(out)
     }
-    /// [Identifier] = [`Identifier`](TokenKind::Identifier)
-    pub fn identifier(&mut self) -> PResult<Identifier> {
+    /// [Sym] = [`Identifier`](TokenKind::Identifier)
+    pub fn identifier(&mut self) -> PResult<Sym> {
         let tok = self.match_type(TokenKind::Identifier, Parsing::Identifier)?;
         match tok.data() {
             TokenData::String(ident) => Ok(ident.into()),