checker: fix generic argument resolution for multiple generic args (#18073)

vlib/v/checker/check_types.v

@@ -1014,8 +1014,8 @@ fn (mut c Checker) infer_fn_generic_types(func ast.Fn, mut node ast.CallExpr) {
 					&& c.table.cur_fn.params.len > 0 && func.generic_names.len > 0
 					&& arg.expr is ast.Ident {
 					var_name := (arg.expr as ast.Ident).name
-					for cur_param in c.table.cur_fn.params {
-						if !cur_param.typ.has_flag(.generic) || cur_param.name != var_name {
+					for k, cur_param in c.table.cur_fn.params {
+						if !cur_param.typ.has_flag(.generic) || k < gi || cur_param.name != var_name {
 							continue
 						}
 						typ = cur_param.typ

vlib/v/tests/multiple_generic_resolve_test.v

@@ -0,0 +1,24 @@
+struct App {
+}
+
+struct Config[T] {
+	val T
+}
+
+fn pre_start[T, R](app T, config R) string {
+	return start(app, config.val)
+}
+
+fn start[T, R](app T, otherthing R) R {
+	println(otherthing)
+	return otherthing
+}
+
+fn test_main() {
+	app := App{}
+	testval := 'hello'
+	config := Config[string]{
+		val: testval
+	}
+	assert pre_start(app, config) == 'hello'
+}