cl-ast: Remove Param, replace with flat Pattern

compiler/cl-interpret/src/function/collect_upvars.rs

@@ -1,6 +1,6 @@
 //! Collects the "Upvars" of a function at the point of its creation, allowing variable capture
 use crate::{convalue::ConValue, env::Environment};
-use cl_ast::{ast_visitor::visit::*, Function, Let, Param, Path, PathPart, Pattern, Sym};
+use cl_ast::{ast_visitor::visit::*, Function, Let, Path, PathPart, Pattern, Sym};
 use std::collections::{HashMap, HashSet};
 
 pub fn collect_upvars(f: &Function, env: &Environment) -> super::Upvars {
@@ -67,9 +67,7 @@ impl<'a> Visit<'a> for CollectUpvars<'_> {
     fn visit_function(&mut self, f: &'a cl_ast::Function) {
         let Function { name: _, sign: _, bind, body } = f;
         // parameters can never be upvars
-        for Param { mutability: _, bind } in bind {
-            self.visit_pattern(bind);
-        }
+        bind.iter().for_each(|pat| self.visit_pattern(pat));
         if let Some(body) = body {
             self.visit_expr(body);
         }