Named arguments for user defined functions

1 files changed, 10 insertions, 1 deletions

diff --git a/src/syntax/expr.rs b/src/syntax/expr.rs
index cf9aff4a..9292d5b6 100644
--- a/src/syntax/expr.rs
+++ b/src/syntax/expr.rs
@@ -437,11 +437,20 @@ pub struct ClosureExpr {
     /// This only exists if you use the function syntax sugar: `let f(x) = y`.
     pub name: Option<Ident>,
     /// The parameter bindings.
-    pub params: Rc<Vec<Ident>>,
+    pub params: Vec<ClosureParam>,
     /// The body of the closure.
     pub body: Rc<Expr>,
 }
 
+/// An parameter to a closure: `x` or `draw: false`.
+#[derive(Debug, Clone, PartialEq)]
+pub enum ClosureParam {
+    /// A positional parameter.
+    Pos(Ident),
+    /// A named parameter with a default value.
+    Named(Named),
+}
+
 /// A with expression: `f with (x, y: 1)`.
 ///
 /// Applies arguments to a function.