compiler: generic variadic fix

vlib/compiler/fn.v

@@ -1059,7 +1059,7 @@ fn (p mut Parser) fn_call_args(f mut Fn) {
 	// varargs
 	varg_type, varg_values := p.fn_call_vargs(f)
 	if f.is_variadic {
-		saved_args << '...$varg_type'
+		saved_args << varg_type
 	}
 	if p.tok == .comma {
 		p.error('wrong number of arguments for fn `$f.name`: expected $f.args.len, but got more')
@@ -1158,11 +1158,12 @@ fn (p mut Parser) replace_type_params(f &Fn, ti TypeInst) []string {
 			fi = fi.right(6)
 			fr += 'array_'
 		}
-		if fi.starts_with('...') {
-			fi = fi.right(3)
-		}
+		is_varg := fi.starts_with('...')
+		if is_varg { fi = fi.right(3) }
 		if fi in ti.inst.keys() {
-			fr += ti.inst[fi]
+			mut t := ti.inst[fi]
+			if is_varg { t = '...$t' }
+			fr += t
 			// println("replaced $a => $fr")
 		} else {
 			fr += fi

vlib/compiler/tests/fn_variadic_test.v

@@ -2,7 +2,7 @@ struct VaTestGroup {
 	name string
 }
 
-fn variadic_test_a(name string, groups ...VaTestGroup) {
+fn variadic_test(name string, groups ...VaTestGroup) {
 	assert groups.len == 2
 	assert groups[0].name == 'users' 
 	assert groups[1].name == 'admins'
@@ -11,5 +11,15 @@ fn variadic_test_a(name string, groups ...VaTestGroup) {
 fn test_fn_variadic() {
 	group1 := VaTestGroup{name: 'users'}
 	group2 := VaTestGroup{name: 'admins'}
-	variadic_test_a('joe', group1, group2)
+	variadic_test('joe', group1, group2)
+}
+
+fn variadic_test_generic<T>(a int, b ...T) T {
+	b1 := b[0]
+	b2 := b[1]
+	return '$a $b1 $b2'
+}
+
+fn test_fn_variadic_generic() {
+	assert variadic_test_generic(111, 'hello', 'v') == '111 hello v'
 }