From d4fed2da95c5914923b90f8f33d1d726d2997e5b Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Wed, 1 Jan 2025 09:30:45 -0300
Subject: [PATCH] fix

---
 vlib/v/checker/fn.v                         |  3 ++-
 vlib/x/json2/tests/decode_map_of_map_test.v | 13 +++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 vlib/x/json2/tests/decode_map_of_map_test.v

diff --git a/vlib/v/checker/fn.v b/vlib/v/checker/fn.v
index 92a27035e0c2ea..bf2287c0354a1b 100644
--- a/vlib/v/checker/fn.v
+++ b/vlib/v/checker/fn.v
@@ -1509,7 +1509,8 @@ fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool) ast.
 		if call_arg.expr is ast.MapInit && e_sym.kind == .struct {
 			c.error('cannot initialize a struct with a map', call_arg.pos)
 			continue
-		} else if call_arg.expr is ast.StructInit && e_sym.kind == .map {
+		} else if call_arg.expr is ast.StructInit && e_sym.kind == .map
+			&& !call_arg.expr.typ.has_flag(.generic) {
 			c.error('cannot initialize a map with a struct', call_arg.pos)
 			continue
 		}
diff --git a/vlib/x/json2/tests/decode_map_of_map_test.v b/vlib/x/json2/tests/decode_map_of_map_test.v
new file mode 100644
index 00000000000000..aa57b54e83d77d
--- /dev/null
+++ b/vlib/x/json2/tests/decode_map_of_map_test.v
@@ -0,0 +1,13 @@
+import x.json2
+
+struct CrossVerifyResult {
+	confusion_matrix_map map[string]map[string]f64
+}
+
+fn test_main() {
+	x := json2.decode[CrossVerifyResult]('') or {
+		assert err.msg().contains('invalid token')
+		return
+	}
+	assert false
+}