From ff38f7cc61e9a1e9944406eb296140f4f9807d7d Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Mon, 8 Feb 2021 18:17:14 +0900
Subject: [PATCH] Uh, that's not quite what Python is doing, but...

---
 src/compiler.c |  8 +++++++-
 src/obj_list.c | 10 ++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/compiler.c b/src/compiler.c
index 81d80df..c602789 100644
--- a/src/compiler.c
+++ b/src/compiler.c
@@ -528,7 +528,13 @@ static void get_(int canAssign) {
 			expression();
 			emitByte(OP_INVOKE_SETSLICE);
 		} else if (canAssign && matchAssignment()) {
-			error("operator-assignment not supported on slice");
+			/* o s e */
+			emitBytes(OP_DUP, 2); /* o s e o */
+			emitBytes(OP_DUP, 2); /* o s e o s */
+			emitBytes(OP_DUP, 2); /* o s e o s e */
+			emitByte(OP_INVOKE_GETSLICE); /* o s e v */
+			assignmentValue();
+			emitByte(OP_INVOKE_SETSLICE);
 		} else if (inDel && matchEndOfDel()) {
 			emitByte(OP_INVOKE_DELSLICE);
 			inDel = 2;
diff --git a/src/obj_list.c b/src/obj_list.c
index 91d86ed..4364679 100644
--- a/src/obj_list.c
+++ b/src/obj_list.c
@@ -355,6 +355,15 @@ KRK_METHOD(list,sort,{
 	qsort(self->values.values, self->values.count, sizeof(KrkValue), _list_sorter);
 })
 
+KRK_METHOD(list,__add__,{
+	METHOD_TAKES_EXACTLY(1);
+	if (!IS_list(argv[1])) return TYPE_ERROR(list,argv[1]);
+
+	KrkValue outList = krk_list_of(self->values.count, self->values.values); /* copy */
+	FUNC_NAME(list,extend)(2,(KrkValue[]){outList,argv[1]},0); /* extend */
+	return outList;
+})
+
 FUNC_SIG(listiterator,__init__);
 
 KRK_METHOD(list,__iter__,{
@@ -437,6 +446,7 @@ void _createAndBind_listClass(void) {
 	BIND_METHOD(list,__setslice__);
 	BIND_METHOD(list,__iter__);
 	BIND_METHOD(list,__mul__);
+	BIND_METHOD(list,__add__);
 	BIND_METHOD(list,append);
 	BIND_METHOD(list,extend);
 	BIND_METHOD(list,pop);