Var decl with repeat

crates/codegen/src/statement.rs

@@ -188,14 +188,35 @@ impl GenRust for Statement {
 
 impl GenRust for VarDecl {
     fn gen_rust(&self, ctx: &mut Context, cg: &mut RustCodegen) {
-        self.name.gen_rust(ctx, cg);
+        if self.tuple_names.is_empty() {
+            self.name.gen_rust(ctx, cg);
+            cg.add(
+                &self
+                    .type_
+                    .as_ref()
+                    .map(|t| format!(": {}", t.get_rust()))
+                    .unwrap_or_default(),
+            );
+        } else {
+            cg.add("(");
+            self.name.gen_rust(ctx, cg);
+            for name in &self.tuple_names {
+                cg.add(", ");
 
-        cg.add(
-            &self
-                .type_
-                .as_ref()
-                .map(|t| format!(": {}", t.get_rust()))
-                .unwrap_or_default(),
-        );
+                name.gen_rust(ctx, cg);
+            }
+            cg.add(")");
+
+            cg.add(
+                &self
+                    .type_
+                    .as_ref()
+                    .map(|t| {
+                        let t = vec![t.get_rust(); self.tuple_names.len() + 1];
+                        format!(": ({})", t.join(", "))
+                    })
+                    .unwrap_or_default(),
+            );
+        }
     }
 }

crates/parser/src/ast/statement.rs

@@ -44,8 +44,9 @@ pub struct MatchItem(pub Vec<Pattern>, pub Expression);
 
 #[derive(Debug, Clone, Serialize)]
 pub struct VarDecl {
-    pub name: Pattern,
     pub type_: Option<TypeExpr>,
+    pub name: Pattern,
+    pub tuple_names: Vec<Pattern>,
 }
 
 #[derive(Debug, Clone, Serialize)]

crates/parser/src/grammar.pest

@@ -226,8 +226,8 @@ attributes = {
 // DECLARATION HELPERS
 // ======================================================
 var_decl = {
-    ("let" ~ pattern)
-  | type_expr ~ (!tuple_pattern ~ pattern)
+    ("let" ~ pattern ~ ("," ~ pattern)*)
+  | type_expr ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)*)
 }
 
 field = {

crates/parser/src/parser/common/decl.rs

@@ -56,6 +56,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDecl {
                         .map(TypeExpr::try_from)
                         .transpose()?,
                     name: Pattern::try_from(inner.next().unwrap())?,
+                    tuple_names: collect_recovered(inner)?,
                 })
             }