checker: strengthen the judgment of generic type parameters replaceme…

…nt, merge generic type init tests (#13460)

vlib/v/checker/struct.v

@@ -154,7 +154,8 @@ pub fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
 				}
 			}
 		}
-		if node.generic_types.len > 0 && struct_sym.info.generic_types != node.generic_types {
+		if node.generic_types.len > 0 && struct_sym.info.generic_types.len == node.generic_types.len
+			&& struct_sym.info.generic_types != node.generic_types {
 			c.table.replace_generic_type(node.typ, node.generic_types)
 		}
 	} else if struct_sym.info is ast.Alias {

vlib/v/checker/tests/generics_struct_init_type_parameter_err.out

@@ -1,14 +1,28 @@
 vlib/v/checker/tests/generics_struct_init_type_parameter_err.vv:6:9: error: generic struct init type parameter `U` must be within the parameters `(A,B)` of the current generic function
     4 |
-    5 | pub fn send<A, B>(res A, b B) string {
+    5 | fn send_1<A, B>(res A, b B) string {
     6 |     msg := Response<U>{
       |            ~~~~~~~~~~~~
     7 |         result: res
     8 |     }
 vlib/v/checker/tests/generics_struct_init_type_parameter_err.vv:7:3: error: cannot assign to field `result`: expected `U`, not `int`
-    5 | pub fn send<A, B>(res A, b B) string {
+    5 | fn send_1<A, B>(res A, b B) string {
     6 |     msg := Response<U>{
     7 |         result: res
       |         ~~~~~~~~~~~
     8 |     }
     9 |     println(b)
+vlib/v/checker/tests/generics_struct_init_type_parameter_err.vv:14:9: error: generic struct init expects 1 generic parameter, but got 2
+   12 |
+   13 | fn send_2<A, B>(res A, b B) string {
+   14 |     msg := Response<A, B>{
+      |            ~~~~~~~~~~~~~~~
+   15 |         result: res
+   16 |     }
+vlib/v/checker/tests/generics_struct_init_type_parameter_err.vv:15:3: error: cannot assign to field `result`: expected `U`, not `int`
+   13 | fn send_2<A, B>(res A, b B) string {
+   14 |     msg := Response<A, B>{
+   15 |         result: res
+      |         ~~~~~~~~~~~
+   16 |     }
+   17 |     println(b)

vlib/v/checker/tests/generics_struct_init_type_parameter_err.vv

@@ -2,15 +2,26 @@ struct Response<U> {
 	result U
 }
 
-pub fn send<A, B>(res A, b B) string {
+fn send_1<A, B>(res A, b B) string {
 	msg := Response<U>{
 		result: res
 	}
 	println(b)
 	return '$msg'
 }
 
+fn send_2<A, B>(res A, b B) string {
+	msg := Response<A, B>{
+		result: res
+	}
+	println(b)
+	return '$msg'
+}
+
 fn main() {
-	mut ret := send(123, 22.2)
+	mut ret := send_1(123, 22.2)
+	println(ret)
+
+	ret = send_2(123, 22.2)
 	println(ret)
 }