From 031fce4361f13d4c60454ec3f75c1db6dcdc1f95 Mon Sep 17 00:00:00 2001
From: larpon <768942+larpon@users.noreply.github.com>
Date: Sat, 10 May 2025 10:40:12 +0200
Subject: [PATCH] toml: add compile error when passing `encode/1` types of T !=
 struct (fix #24435) (#24443)

---
 vlib/toml/toml.v | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/vlib/toml/toml.v b/vlib/toml/toml.v
index 65a4b91cf0..2233d4b7ee 100644
--- a/vlib/toml/toml.v
+++ b/vlib/toml/toml.v
@@ -167,13 +167,18 @@ fn decode_struct[T](doc Any, mut typ T) {
 // encode encodes the type `T` into a TOML string.
 // If `T` has a custom `.to_toml()` method, it will be used instead of the default.
 pub fn encode[T](typ T) string {
-	$for method in T.methods {
-		$if method.name == 'to_toml' {
-			return typ.$method()
+	$if T is $struct {
+		$for method in T.methods {
+			$if method.name == 'to_toml' {
+				return typ.$method()
+			}
 		}
+		mp := encode_struct[T](typ)
+		return mp.to_toml()
+	} $else {
+		$compile_error('Currently only type `struct` is supported for `T` to encode as TOML')
 	}
-	mp := encode_struct[T](typ)
-	return mp.to_toml()
+	return ''
 }
 
 fn encode_struct[T](typ T) map[string]Any {