From fcef8c98ee2afa9c3cfc0f8317d022c5ed0df3ba Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Mon, 20 Feb 2023 18:26:48 +0800
Subject: [PATCH] cgen: fix map of array initialisation, with len and no
 default (fix #17358) (#17367)

---
 vlib/v/gen/c/array.v           |  3 ++-
 vlib/v/tests/array_init_test.v | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/vlib/v/gen/c/array.v b/vlib/v/gen/c/array.v
index b200209601..0555c731a5 100644
--- a/vlib/v/gen/c/array.v
+++ b/vlib/v/gen/c/array.v
@@ -195,7 +195,8 @@ fn (mut g Gen) array_init_with_fields(node ast.ArrayInit, elem_type Type, is_amp
 	noscan := g.check_noscan(elem_type.typ)
 	is_default_array := elem_type.unaliased_sym.kind == .array && node.has_default
 	is_default_map := elem_type.unaliased_sym.kind == .map && node.has_default
-	needs_more_defaults := node.has_len && g.struct_has_array_or_map_field(elem_type.typ)
+	needs_more_defaults := node.has_len && (g.struct_has_array_or_map_field(elem_type.typ)
+		|| elem_type.unaliased_sym.kind in [.array, .map])
 	if node.has_it { // []int{len: 6, init: it * it} when variable it is used in init expression
 		g.inside_lambda = true
 		mut tmp := g.new_tmp_var()
diff --git a/vlib/v/tests/array_init_test.v b/vlib/v/tests/array_init_test.v
index 910a17f1eb..2da51c8d60 100644
--- a/vlib/v/tests/array_init_test.v
+++ b/vlib/v/tests/array_init_test.v
@@ -257,3 +257,18 @@ fn test_multi_array_update_data() {
 	println(a)
 	assert '${a}' == '[[[0, 0], [0, 2], [0, 0]], [[0, 0], [0, 0], [0, 0]]]'
 }
+
+fn test_array_of_map_with_len_no_default() {
+	mut arr := []map[int]int{len: 3}
+	arr[0][0] = 0
+	arr[1][1] = 1
+	arr[2][2] = 2
+	println(arr)
+	assert arr == [{
+		0: 0
+	}, {
+		1: 1
+	}, {
+		2: 2
+	}]
+}