From 125921db669e4ef6b4fb98efb52bc641db61b82f Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Tue, 6 Jun 2023 13:57:40 -0300
Subject: [PATCH] cgen: fix nested fixed array instantiation (#18357)

---
 vlib/v/gen/c/array.v                   | 16 ++++++++++++++++
 vlib/v/tests/multiple_arr_fixed_test.v |  8 ++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 vlib/v/tests/multiple_arr_fixed_test.v

diff --git a/vlib/v/gen/c/array.v b/vlib/v/gen/c/array.v
index 4430f119d3..a4a45f5c8b 100644
--- a/vlib/v/gen/c/array.v
+++ b/vlib/v/gen/c/array.v
@@ -172,6 +172,7 @@ fn (mut g Gen) fixed_array_init(node ast.ArrayInit, array_type Type, var_name st
 	} else {
 		elem_sym := g.table.final_sym(node.elem_type)
 		if elem_sym.kind == .map {
+			// fixed array for map -- [N]map[key_type]value_type
 			info := array_type.unaliased_sym.info as ast.ArrayFixed
 			map_info := elem_sym.map_info()
 			g.expr(ast.MapInit{
@@ -185,6 +186,21 @@ fn (mut g Gen) fixed_array_init(node ast.ArrayInit, array_type Type, var_name st
 					value_type: map_info.value_type
 				})
 			}
+		} else if elem_sym.kind == .array_fixed {
+			// nested fixed array -- [N][N]type
+			info := array_type.unaliased_sym.info as ast.ArrayFixed
+			arr_info := elem_sym.array_fixed_info()
+			g.expr(ast.ArrayInit{
+				typ: node.elem_type
+				elem_type: arr_info.elem_type
+			})
+			for _ in 1 .. info.size {
+				g.write(', ')
+				g.expr(ast.ArrayInit{
+					typ: node.elem_type
+					elem_type: arr_info.elem_type
+				})
+			}
 		} else {
 			g.write('0')
 		}
diff --git a/vlib/v/tests/multiple_arr_fixed_test.v b/vlib/v/tests/multiple_arr_fixed_test.v
new file mode 100644
index 0000000000..7cc060a9c1
--- /dev/null
+++ b/vlib/v/tests/multiple_arr_fixed_test.v
@@ -0,0 +1,8 @@
+fn test_main() {
+	mut arr := [2][3][2]map[string]string{}
+	arr[0][0][1]['key'] = 'value'
+	dump(arr)
+	assert arr[0][0][1] == {
+		'key': 'value'
+	}
+}