From 1de53730bce0bd3f9de89db1da7c19b7889b9a75 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Fri, 27 Jan 2023 12:04:23 +0100
Subject: Symbol values and modules

---
 src/model/scope.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/model/scope.rs')

diff --git a/src/model/scope.rs b/src/model/scope.rs
index bb0d4684..40307cba 100644
--- a/src/model/scope.rs
+++ b/src/model/scope.rs
@@ -108,6 +108,15 @@ impl Scope {
         self.0.insert(var.into(), Slot::new(value.into(), Kind::Captured));
     }
 
+    /// Copy definitions from another scope that aren't yet defined in this one.
+    pub fn copy_from(&mut self, other: &Self) {
+        for (name, value) in other.iter() {
+            self.0
+                .entry(name.clone())
+                .or_insert_with(|| Slot::new(value.clone(), Kind::Normal));
+        }
+    }
+
     /// Try to access a variable immutably.
     pub fn get(&self, var: &str) -> Option<&Value> {
         self.0.get(var).map(Slot::read)
-- 
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