Pattern matching experimental code

WIP

schala-lang/src/reduced_ast.rs

@@ -58,8 +58,8 @@ pub enum Expr {
 #[derive(Debug, Clone)]
 pub struct Alternative {
   pub tag: Option<usize>,
-  pub guard: Option<Expr>,
+  pub guards: Vec<Expr>,
-  pub bound_vars: Vec<Option<Rc<String>>>, //remember that order matters here
+  pub bound_vars: Vec<Option<Rc<String>>>, //order here is iconic to order in a tuple-like type, None is equivalent to ignored
   pub item: Vec<Stmt>,
 }
 
@@ -160,7 +160,7 @@ fn reduce_if_expression(discriminator: &Discriminator, body: &IfExpressionBody,
         pat.to_alternative(then_clause, symbol_table),
         Alternative {
           tag: None,
-          guard: None,
+          guards: vec![],
           bound_vars: vec![],
           item: else_clause,
         },
@@ -196,6 +196,12 @@ impl Pattern {
           SymbolSpec::DataConstructor { index, .. } => index.clone(),
           _ => panic!("Bad symbol"),
         };
+
+        let guards = patterns.iter().map(|p| match p {
+
+
+        });
+
         let bound_vars = subpatterns.iter().map(|p| match p {
           Literal(PatternLiteral::VarPattern(var)) => Some(var.clone()),
           Ignored => None,
@@ -203,7 +209,7 @@ impl Pattern {
         }).collect();
         Alternative {
           tag: Some(tag),
-          guard: None,
+          guards,
           bound_vars,
           item,
         }