Add subpattern struct

schala-lang/language/src/reduced_ast.rs

@@ -59,7 +59,7 @@ pub enum Expr {
 #[derive(Debug, Clone)]
 pub struct Alternative {
   pub tag: Option<usize>,
-  pub subpatterns: Vec<Alternative>,
+  pub subpatterns: Vec<Option<Subpattern>>,
   pub guard: Option<Expr>,
   pub bound_vars: Vec<Option<Rc<String>>>, //remember that order matters here
   pub item: Vec<Stmt>,
@@ -71,6 +71,14 @@ impl Alternative {
   }
 }
 
+#[derive(Debug, Clone)]
+pub struct Subpattern {
+  pub tag: Option<usize>,
+  pub subpatterns: Vec<Subpattern>,
+  pub bound_vars: Vec<Option<Rc<String>>>,
+  pub guard: Option<Expr>,
+}
+
 #[derive(Debug, Clone)]
 pub enum Lit {
   Nat(u64),