From 4524539c2bc5f3a9f53bc57a1902264fc894969b Mon Sep 17 00:00:00 2001
From: Marmare314 <49279081+Marmare314@users.noreply.github.com>
Date: Thu, 20 Apr 2023 11:05:11 +0200
Subject: forbid underscore as identifier closes #513 (#837)

---
 src/eval/func.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/eval/func.rs')

diff --git a/src/eval/func.rs b/src/eval/func.rs
index faf2d696..29b85f7a 100644
--- a/src/eval/func.rs
+++ b/src/eval/func.rs
@@ -274,6 +274,8 @@ pub enum Param {
     Named(Ident, Value),
     /// An argument sink: `..args`.
     Sink(Option<Ident>),
+    /// A placeholder: `_`.
+    Placeholder,
 }
 
 impl Closure {
@@ -334,6 +336,9 @@ impl Closure {
                         args.named::<Value>(ident)?.unwrap_or_else(|| default.clone());
                     vm.define(ident.clone(), value);
                 }
+                Param::Placeholder => {
+                    args.eat::<Value>()?;
+                }
             }
         }
 
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