From c92ff6140e0bd46564dafffc66a206f4b208d80a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vili=20Sinerv=C3=A4?= <vili.m.sinerva@gmail.com>
Date: Tue, 4 Feb 2025 15:21:04 +0200
Subject: [PATCH] Fix if-then interpreting to align with language spec

---
 src/compiler/interpreter.rs | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/compiler/interpreter.rs b/src/compiler/interpreter.rs
index c46890e..cd4a78f 100644
--- a/src/compiler/interpreter.rs
+++ b/src/compiler/interpreter.rs
@@ -81,16 +81,21 @@ pub fn interpret<'source>(ast: &Expression<'source>, symbols: &mut SymTab<'sourc
             Value::None()
         }
         Conditional(_, condition_expr, then_expr, else_expr) => {
-            if let Value::Bool(condition) = interpret(condition_expr, symbols) {
+            let Value::Bool(condition) = interpret(condition_expr, symbols) else {
+                panic!("Non-bool as if-then-else condition!");
+            };
+
+            if let Some(else_expr) = else_expr {
                 if condition {
                     interpret(then_expr, symbols)
-                } else if let Some(expr) = else_expr {
-                    interpret(expr, symbols)
                 } else {
-                    Value::None()
+                    interpret(else_expr, symbols)
                 }
             } else {
-                panic!("Non-bool as if-then-else condition!");
+                if condition {
+                    interpret(then_expr, symbols);
+                }
+                Value::None()
             }
         }
         While(_, condition, do_expr) => {