| 1 | // Tests of call chaining f(g()) when g has multiple return values (MRVs). |
|---|---|
| 2 | // See https://code.google.com/p/go/issues/detail?id=4573. |
| 3 | |
| 4 | package main |
| 5 | |
| 6 | func assert(actual, expected int) { |
| 7 | if actual != expected { |
| 8 | panic(actual) |
| 9 | } |
| 10 | } |
| 11 | |
| 12 | func g() (int, int) { |
| 13 | return 5, 7 |
| 14 | } |
| 15 | |
| 16 | func g2() (float64, float64) { |
| 17 | return 5, 7 |
| 18 | } |
| 19 | |
| 20 | func f1v(x int, v ...int) { |
| 21 | assert(x, 5) |
| 22 | assert(v[0], 7) |
| 23 | } |
| 24 | |
| 25 | func f2(x, y int) { |
| 26 | assert(x, 5) |
| 27 | assert(y, 7) |
| 28 | } |
| 29 | |
| 30 | func f2v(x, y int, v ...int) { |
| 31 | assert(x, 5) |
| 32 | assert(y, 7) |
| 33 | assert(len(v), 0) |
| 34 | } |
| 35 | |
| 36 | func complexArgs() (float64, float64) { |
| 37 | return 5, 7 |
| 38 | } |
| 39 | |
| 40 | func appendArgs() ([]string, string) { |
| 41 | return []string{"foo"}, "bar" |
| 42 | } |
| 43 | |
| 44 | func h() (i interface{}, ok bool) { |
| 45 | m := map[int]string{1: "hi"} |
| 46 | i, ok = m[1] // string->interface{} conversion within multi-valued expression |
| 47 | return |
| 48 | } |
| 49 | |
| 50 | func h2() (i interface{}, ok bool) { |
| 51 | ch := make(chan string, 1) |
| 52 | ch <- "hi" |
| 53 | i, ok = <-ch // string->interface{} conversion within multi-valued expression |
| 54 | return |
| 55 | } |
| 56 | |
| 57 | func main() { |
| 58 | f1v(g()) |
| 59 | f2(g()) |
| 60 | f2v(g()) |
| 61 | if c := complex(complexArgs()); c != 5+7i { |
| 62 | panic(c) |
| 63 | } |
| 64 | if s := append(appendArgs()); len(s) != 2 || s[0] != "foo" || s[1] != "bar" { |
| 65 | panic(s) |
| 66 | } |
| 67 | i, ok := h() |
| 68 | if !ok || i.(string) != "hi" { |
| 69 | panic(i) |
| 70 | } |
| 71 | i, ok = h2() |
| 72 | if !ok || i.(string) != "hi" { |
| 73 | panic(i) |
| 74 | } |
| 75 | } |
| 76 |
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