work

src/parser/nodes/func.rs

@@ -0,0 +1,29 @@
+use super::*;
+
+pub struct Func {
+    args: Vec<Id<Ident>>,
+    body: Id<Expr>,
+}
+
+impl Parsable for Func {
+    fn parse(ctx: &mut ParseCtx) -> Result<Self, CompilerMsg> {
+        ctx.expect(Token::OpenParen)?;
+        let args = ctx.list(Token::Comma, Token::CloseParen)?;
+        let body = ctx.parse()?;
+        Ok(Self { args, body })
+    }
+}
+
+impl FmtNode for Func {
+    fn fmt(&self, f: &mut std::fmt::Formatter, ctx: DisplayCtx) -> std::fmt::Result {
+        write!(f, "(")?;
+        if let Some((last, rest)) = self.args.split_last() {
+            for arg in rest {
+                write!(f, "{}, ", arg.dsp(ctx))?;
+            }
+            write!(f, "{}", last.dsp(ctx))?;
+        }
+        write!(f, ") {}", self.body.dsp(ctx))?;
+        Ok(())
+    }
+}