From 28e1b43b81239b20a109c9fa45522af77b08333a Mon Sep 17 00:00:00 2001
From: Sofia <sofia@teascade.net>
Date: Wed, 18 Mar 2026 19:47:47 +0200
Subject: [PATCH] Fix varargs for single value returns

---
 examples/test.lua | 40 ++++++++++++++++++++++++++++++++++++----
 src/compile.rs    |  9 +++++++--
 src/vm.rs         | 46 ++++++++++++++++++++++++++++++++--------------
 3 files changed, 75 insertions(+), 20 deletions(-)

diff --git a/examples/test.lua b/examples/test.lua
index 4bf4084..3d02370 100644
--- a/examples/test.lua
+++ b/examples/test.lua
@@ -1,7 +1,39 @@
+global b = 5
 
-function f(x, ...)
-    local b, c = ...
-    return x + 5, b, c
+function add(x)
+    return function (y)
+        x = x + 1
+        b = b + 1
+        return x + y, 1, 2, b
+    end
 end
 
-print(123, f(10, 11, 12))
+function min(x, y)
+    local m = x
+    if y < x then
+        m = y
+    end
+    return m
+end
+
+
+function f(x, ...)
+    local b = {10, ..., add(10)(15)}
+    return x + 5, b
+end
+
+global sometable = {}
+sometable["hello"] = { 100, 150, add(10)(15) }
+print(#sometable["hello"])
+sometable["hello"].there = "my dude"
+print(sometable.hello.there)
+
+print(max(11.12345, 9))
+print(add(10)(15))
+print(add(10)(15))
+print(b)
+print(min(11, 9))
+print(10 - 15)
+print("hello there!")
+print(true or 0)
+print(123, f(10, 11, 12))
\ No newline at end of file
diff --git a/src/compile.rs b/src/compile.rs
index 7be1ede..90d07cb 100644
--- a/src/compile.rs
+++ b/src/compile.rs
@@ -750,8 +750,13 @@ impl Expression {
                 }
                 let mut instructions = Vec::new();
                 let new_reg = scope.register_counter.new();
-                instructions.push(Instruction::Vararg(new_reg));
-                (instructions, Vec::new())
+                if expected_values == None {
+                    instructions.push(Instruction::Vararg(new_reg, 0));
+                    (instructions, Vec::new())
+                } else {
+                    instructions.push(Instruction::Vararg(new_reg, 3));
+                    (instructions, vec![new_reg])
+                }
             }
         }
     }
diff --git a/src/vm.rs b/src/vm.rs
index f44167f..48fa0f1 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -161,8 +161,8 @@ pub enum Instruction {
     Close(u16),
     /// R(A) := closure(KPROTO[Bx], R(A), ..., R(A+n))
     Closure(u16, u32),
-    /// R(A), ... := varargs
-    Vararg(u16),
+    /// R(A), ... , R(A+B-2) := varargs
+    Vararg(u16, u16),
 }
 
 impl Debug for Instruction {
@@ -200,7 +200,7 @@ impl Debug for Instruction {
             Instruction::Len(arg0, arg1) => write!(f, "LEN {} {}", arg0, arg1),
             Instruction::Or(arg0, arg1, arg2) => write!(f, "OR {} {} {}", arg0, arg1, arg2),
             Instruction::And(arg0, arg1, arg2) => write!(f, "AND {} {} {}", arg0, arg1, arg2),
-            Instruction::Vararg(arg0) => write!(f, "VARARG {}", arg0),
+            Instruction::Vararg(arg0, arg1) => write!(f, "VARARG {} {}", arg0, arg1),
         }
     }
 }
@@ -1097,19 +1097,37 @@ impl ClosureRunner {
                         .unwrap_or(Value::Nil);
                     self.set_stack(*res, StackValue::Value(lhs.and(&rhs)?));
                 }
-                Instruction::Vararg(reg) => {
+                Instruction::Vararg(reg, len) => {
                     self.function_register = reg - 1;
-                    self.top = self.function_register + self.parameters.len() as u16
-                        - prototype.parameters as u16;
+                    if *len == 0 {
+                        self.top = self.function_register + self.parameters.len() as u16
+                            - prototype.parameters as u16;
 
-                    for (i, param) in self
-                        .parameters
-                        .clone()
-                        .iter()
-                        .skip(prototype.parameters)
-                        .enumerate()
-                    {
-                        self.set_stack(*reg + i as u16, StackValue::Value(param.clone()));
+                        for (i, param) in self
+                            .parameters
+                            .clone()
+                            .iter()
+                            .skip(prototype.parameters)
+                            .enumerate()
+                        {
+                            self.set_stack(*reg + i as u16, StackValue::Value(param.clone()));
+                        }
+                    } else {
+                        let len = len - 2;
+                        self.top = self.function_register + len + 1;
+                        for i in 0..len {
+                            self.set_stack(
+                                *reg + i as u16,
+                                StackValue::Value(
+                                    self.parameters
+                                        .iter()
+                                        .skip(prototype.parameters)
+                                        .next()
+                                        .unwrap_or(&Value::Nil)
+                                        .clone(),
+                                ),
+                            );
+                        }
                     }
                 }
             };