Core: Remove AST_Tuple, repurpose VAR_UNPACK (buggy probably)

core_compiler_interface.hpp

@@ -218,7 +218,6 @@ enum Ast_Type_Kind {
     TYPE_ENUM,
     TYPE_TYPE,
     TYPE_SLICE,
-    TYPE_TUPLE,
 
     TYPE_COMPLETING,
     TYPE_INCOMPLETE,
@@ -509,7 +508,7 @@ struct Ast_Builtin : Ast_Expr {
 
 struct Ast_Return : Ast {
     Ast_Type *resolved_type;
-    Array<Ast_Expr *> expr;
+    Ast_Expr *expr;
 };
 
 struct Ast_If_Node : Ast {
@@ -538,16 +537,7 @@ struct Ast_For : Ast {
 
 struct Ast_Lambda : Ast_Expr {
     Array<Ast_Decl *> args;
-
-    // :Multiple arguments
-    // @todo: maybe disallow multiple arguments in current form
-    // and use polimorphism. Then we could make var unpacking,
-    // unpack structs making it more powerful
-
-    // @cleanup @refactor: return value shouldn't be a array of expressions.
-    // It should be a single expression. So probably need a special type
-    // for that.
-    Array<Ast_Expr *> ret;
+    Ast_Expr *ret;
     Ast_Scope *scope;
 };