feature: add -syscall option to enable use of syscall symbols (#723)

* fix: make interpreter methods discoverable by runtime

When generating an interface wrapper, lookup existing wrappers by method
to get the one with the biggest set of methods implemented by interpreter.

A string method is also added to wrappers, in order to provide a string
representation of the interpreter value rather than the wrapper itself
(at least for %s and %v verbs).

This allows the runtime to pickup an interpreter method automatically
even if the conversion to the interface is not specified in the script. As
in Go spec, it is enough for the type to implement the required methods.

A current limitation is that only single wrappers can be instantiated,
not allowing to compose interfaces.

This limitation can be removed when the Go reflect issue
https://github.com/golang/go/issues/15924 is fixed.

Fixes #435.

* test: add a simpler test

.golangci.toml

@@ -37,6 +37,10 @@
     "funlen",
     "gocognit",
     "stylecheck",
+    "gomnd",
+    "testpackage",
+    "goerr113",
+    "nestif",
   ]
 
 [issues]

.travis.yml

@@ -19,8 +19,8 @@ cache:
 matrix:
   fast_finish: true
   include:
-    - go: 1.12.x
     - go: 1.13.x
+    - go: 1.14.x
       env: STABLE=true
 
 env:
@@ -39,7 +39,7 @@ install:
   - go mod download
 
 before_script:
-  - rm -f interp/op.go interp/interp_test.go
+  - rm -f interp/op.go
   - make generate
   - git update-index -q --refresh
   - CHANGED=$(git diff-index --name-only HEAD --)

CONTRIBUTING.md

@@ -13,7 +13,12 @@ discussions.
 Once the proposal is approved, a Pull Request can be opened. If you want
 to provide early visibility to reviewers, create a [Draft Pull Request].
 
+We will also require you to sign the [Containous Contributor License Agreement]
+after you submit your first pull request to this project. The link to sign the
+agreement will be presented to you in the web interface of the pull request.
+
 [Issues]: https://github.com/containous/yaegi/issues
 [Pull Requests]: https://github.com/containous/yaegi/issues
 [Feature Request]: https://github.com/containous/yaegi/issues/new?template=feature_request.md
 [Draft Pull Request]: https://github.blog/2019-02-14-introducing-draft-pull-requests/
+[Containous Contributor License Agreement]: https://cla-assistant.io/containous/yaegi

README.md

@@ -18,7 +18,7 @@ It powers executable Go scripts and plugins, in embedded interpreters or interac
 * Works everywhere Go works
 * All Go & runtime resources accessible from script (with control)
 * Security: `unsafe` and `syscall` packages neither used nor exported by default
-* Support Go 1.12 and Go 1.13 (the latest 2 major releases)
+* Support Go 1.13 and Go 1.14 (the latest 2 major releases)
 
 ## Install
 
@@ -129,6 +129,24 @@ $ yaegi cmd/yaegi/yaegi.go
 >
 ```
 
+Or for Go scripting in the shebang line:
+
+```console
+$ cat /tmp/test
+#!/usr/bin/env yaegi
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("test")
+}
+$ ls -la /tmp/test
+-rwxr-xr-x 1 dow184 dow184 93 Jan  6 13:38 /tmp/test
+$ /tmp/test
+test
+```
+
 ## Documentation
 
 Documentation about Yaegi commands and libraries can be found at usual [godoc.org][docs].

_test/a40.go

@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+type rule uint8
+
+const (
+	r0 rule = iota
+	r1
+	r2
+)
+
+var a = [...]int{
+	r0: 1,
+	r1: 12,
+}
+
+func main() {
+	fmt.Println(a)
+}
+
+// Output:
+// [1 12]

_test/a41.go

@@ -0,0 +1,10 @@
+package main
+
+var a = [...]bool{true, true}
+
+func main() {
+	println(a[0] && true)
+}
+
+// Output:
+// true

_test/add0.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	var a interface{} = 2 + 5
+	println(a.(int))
+}
+
+// Output:
+// 7

_test/add1.go

@@ -0,0 +1,10 @@
+package main
+
+func main() {
+	b := 2
+	var a interface{} = 5 + b
+	println(a.(int))
+}
+
+// Output:
+// 7

_test/add2.go

@@ -0,0 +1,12 @@
+package main
+
+type iface interface{}
+
+func main() {
+	b := 2
+	var a iface = 5 + b
+	println(a.(int))
+}
+
+// Output:
+// 7

_test/and3.go

@@ -0,0 +1,10 @@
+package main
+
+var a = true && true
+
+func main() {
+	println(a)
+}
+
+// Output:
+// true

_test/append0.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func f(a []int, b int) interface{} { return append(a, b) }
+
+func main() {
+	a := []int{1, 2}
+	r := f(a, 3)
+	fmt.Println(r.([]int))
+}
+
+// Output:
+// [1 2 3]

_test/assign1.go

@@ -9,5 +9,5 @@ func main() {
 	fmt.Println(buf)
 }
 
-// Output
+// Output:
 // []

_test/assign11.go

@@ -0,0 +1,10 @@
+package main
+
+import "fmt"
+
+func main() {
+	_, _, _ = fmt.Println("test")
+}
+
+// Error:
+// 6:2: assignment mismatch: 3 variables but fmt.Println returns 2 values

_test/assign12.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	a, b, c := fmt.Println("test")
+	println(a, b, c)
+}
+
+// Error:
+// 6:2: assignment mismatch: 3 variables but fmt.Println returns 2 values

_test/assign13.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func getStr() string {
+	return "test"
+}
+
+func main() {
+	m := make(map[string]string, 0)
+	m["a"] = fmt.Sprintf("%v", 0.1)
+	m["b"] = string(fmt.Sprintf("%v", 0.1))
+	m["c"] = getStr()
+
+	fmt.Println(m)
+}
+
+// Output:
+// map[a:0.1 b:0.1 c:test]

_test/b1/foo/foo.go

@@ -0,0 +1,7 @@
+package foo
+
+import bar "github.com/containous/yaegi/_test/b2/foo"
+
+var Desc = "in b1/foo"
+
+var Desc2 = Desc + bar.Desc

_test/b2/foo/foo.go

@@ -0,0 +1,3 @@
+package foo
+
+var Desc = "in b2/foo"

_test/bad0.go

@@ -1,4 +1,4 @@
 println("Hello")
 
 // Error:
-// _test/bad0.go:1:1: expected 'package', found println
+// 1:1: expected 'package', found println

_test/baz-bat/baz-bat.go

@@ -0,0 +1,3 @@
+package baz
+
+var Name = "baz-bat"

_test/bin2.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+	fmt.Println(math.Abs(-5))
+}
+
+// Output:
+// 5

_test/bin3.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	str := "part1"
+	str += fmt.Sprintf("%s", "part2")
+	fmt.Println(str)
+}
+
+// Output:
+// part1part2

_test/bin4.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func Bar(s string) bool {
+	a := strings.HasPrefix("fas", "f")
+	b := strings.HasPrefix("aaaaa", "a")
+	a_and_b := strings.HasPrefix("fas", "f") && strings.HasPrefix("aaaaa", "a")
+	fmt.Println(a, b, a && b, a_and_b)
+	return a && b
+}
+
+func main() {
+	println(Bar("kung"))
+}

_test/bin5.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"net"
+)
+
+func main() {
+	addr := net.TCPAddr{IP: net.IPv4(1, 1, 1, 1), Port: 80}
+	var s fmt.Stringer = &addr
+	fmt.Println(s.String())
+}
+
+// Output:
+// 1.1.1.1:80

_test/cap0.go

@@ -0,0 +1,13 @@
+package main
+
+func f(a []int) interface{} {
+	return cap(a)
+}
+
+func main() {
+	a := []int{1, 2}
+	println(f(a).(int))
+}
+
+// Output:
+// 2

_test/chan10.go

@@ -0,0 +1,12 @@
+package main
+
+import "time"
+
+func main() {
+	var tick <-chan time.Time = time.Tick(time.Millisecond)
+	_ = tick
+	println("success")
+}
+
+// Output:
+// success

_test/chan8.go

@@ -0,0 +1,12 @@
+package main
+
+func main() {
+	messages := make(chan bool)
+
+	go func() { messages <- true }()
+
+	println(<-messages && true)
+}
+
+// Output:
+// true

_test/chan9.go

@@ -0,0 +1,20 @@
+package main
+
+type Channel chan string
+
+type T struct {
+	Channel
+}
+
+func send(c Channel) { c <- "ping" }
+
+func main() {
+	t := &T{}
+	t.Channel = make(Channel)
+	go send(t.Channel)
+	msg := <-t.Channel
+	println(msg)
+}
+
+// Output:
+// ping

_test/cli2.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+)
+
+type T struct {
+	ln net.Listener
+}
+
+func (t *T) Close() {
+	t.ln.Close()
+}
+
+func client(uri string) {
+	resp, err := http.Get(uri)
+	if err != nil {
+		log.Fatal(err)
+	}
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(body))
+}
+
+func server(ln net.Listener, ready chan bool) {
+	http.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
+		var r1 *http.Request = r
+		fmt.Fprintln(w, "Welcome to my website!", r1.RequestURI)
+	})
+
+	go http.Serve(ln, nil)
+	ready <- true
+}
+
+func main() {
+	ln, err := net.Listen("tcp", "localhost:0")
+	t := &T{ln}
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer t.Close()
+	//	defer ln.Close()
+
+	ready := make(chan bool)
+	go server(ln, ready)
+	<-ready
+
+	client(fmt.Sprintf("http://%s/hello", ln.Addr().String()))
+	http.DefaultServeMux = &http.ServeMux{}
+}
+
+// Output:
+// Welcome to my website! /hello

_test/comp1.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	var a interface{} = 1 < 2
+	println(a.(bool))
+}
+
+// Output:
+// true

_test/complex3.go

@@ -7,5 +7,5 @@ func main() {
 	fmt.Printf("%T %v\n", s, s)
 }
 
-// Output
+// Output:
 // int 2

_test/complex4.go

@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+func f(a, b float64) interface{} { return complex(a, b) }
+
+func main() {
+	a := f(3, 2)
+	fmt.Println(a.(complex128))
+}
+
+// Output:
+// (3+2i)

_test/composite10.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := []map[int]int{make(map[int]int)}
+
+	for _, b := range a {
+		fmt.Println(b)
+	}
+}
+
+// Output:
+// map[]

_test/composite5.go

@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+type T struct {
+	m uint16
+}
+
+var t = T{1<<2 | 1<<3}
+
+func main() {
+	fmt.Println(t)
+}
+
+// Output:
+// {12}

_test/composite6.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/containous/yaegi/_test/ct1"
+)
+
+type T struct {
+	m uint16
+}
+
+var t = T{1 << ct1.R}
+
+func main() {
+	fmt.Println(t)
+}
+
+// Output:
+// {2}

_test/composite7.go

@@ -0,0 +1,20 @@
+package main
+
+type T struct {
+	name string
+}
+
+var tab = []*T{{
+	name: "foo",
+}, {
+	name: "bar",
+}}
+
+func main() {
+	println(len(tab))
+	println(tab[0].name)
+}
+
+// Output:
+// 2
+// foo

_test/composite8.go

@@ -0,0 +1,16 @@
+package main
+
+type T struct{ I int }
+
+func main() {
+	t := []*T{}
+	s := []int{1, 2}
+	for _, e := range s {
+		x := &T{e}
+		t = append(t, x)
+	}
+	println(t[0].I, t[1].I)
+}
+
+// Output:
+// 1 2

_test/composite9.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := [][]int{make([]int,0)}
+
+	for _, b := range a {
+		fmt.Println(b)
+	}
+}
+
+// Output:
+// []

_test/const10.go

@@ -0,0 +1,17 @@
+package main
+
+const (
+	a = 2
+	b = c + d
+	c = a + d
+	d = e + f
+	e = 3
+	f = 4
+)
+
+func main() {
+	println(b)
+}
+
+// Output:
+// 16

_test/const11.go

@@ -0,0 +1,13 @@
+package main
+
+func main() {
+	const (
+		x = 2 * iota
+		dim
+	)
+	var t [dim * 2]int
+	println(t[0], len(t))
+}
+
+// Output:
+// 0 4

_test/const12.go

@@ -0,0 +1,17 @@
+package main
+
+type Kind int
+
+const (
+	None Kind = 0
+	Left Kind = 1 << iota
+	Right
+	Both Kind = Left | Right
+)
+
+func main() {
+	println(None, Left, Right, Both)
+}
+
+// Output:
+// 0 2 4 6

_test/const13.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	const tooBig = 1267650600228229401496703205376
+	const huge = 1 << 100
+	const large = huge >> 38
+
+	fmt.Println(large)
+}
+
+// Output:
+// 4611686018427387904

_test/const6.go

@@ -0,0 +1,22 @@
+package main
+
+const (
+	maxNonStarters = 30
+	maxBufferSize  = maxNonStarters + 2
+)
+
+type reorderBuffer struct {
+	rune [maxBufferSize]Properties
+}
+
+type Properties struct {
+	pos  uint8
+	size uint8
+}
+
+func main() {
+	println(len(reorderBuffer{}.rune))
+}
+
+// Output:
+// 32

_test/const7.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+const (
+	a = iota
+	b
+	c
+	d
+)
+
+type T [c]int
+
+func main() {
+	fmt.Println(T{})
+}
+
+// Output:
+// [0 0]

_test/const8.go

@@ -0,0 +1,15 @@
+package main
+
+const (
+	a = 2
+	b = c + d
+	c = 4
+	d = 5
+)
+
+func main() {
+	println(a, b, c, d)
+}
+
+// Output:
+// 2 9 4 5

_test/const9.go

@@ -0,0 +1,17 @@
+package main
+
+const (
+	a = 2
+	b = c + d
+	c = a + d
+	d = e + f
+	e = b + 2
+	f = 4
+)
+
+func main() {
+	println(b)
+}
+
+// Error:
+// 5:2: constant definition loop

_test/copy2.go

@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func f(a, b []int) interface{} { return copy(a, b) }
+
+func main() {
+	a := []int{10, 20, 30}
+	b := [4]int{}
+	c := b[:]
+	r := f(c, a)
+	fmt.Println(r.(int))
+}
+
+// Output:
+// 3

_test/ct1/ct1.go

@@ -0,0 +1,9 @@
+package ct1
+
+type Class uint
+
+const (
+	L Class = iota
+	R
+	AL
+)

_test/defer4.go

@@ -0,0 +1,23 @@
+package main
+
+import "sync"
+
+type T struct {
+	mu   sync.RWMutex
+	name string
+}
+
+func (t *T) get() string {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.name
+}
+
+var d = T{name: "test"}
+
+func main() {
+	println(d.get())
+}
+
+// Output:
+// test

_test/defer5.go

@@ -0,0 +1,32 @@
+package main
+
+func f1() {
+	defer println("f1-begin")
+	f2()
+	defer println("f1-end")
+}
+
+func f2() {
+	defer println("f2-begin")
+	f3()
+	defer println("f2-end")
+}
+
+func f3() {
+	defer println("f3-begin")
+	println("hello")
+	defer println("f3-end")
+}
+
+func main() {
+	f1()
+}
+
+// Output:
+// hello
+// f3-end
+// f3-begin
+// f2-end
+// f2-begin
+// f1-end
+// f1-begin

_test/defer6.go

@@ -0,0 +1,27 @@
+package main
+
+func f1() {
+	defer print("f1-begin ")
+	f2()
+	defer print("f1-end ")
+}
+
+func f2() {
+	defer print("f2-begin ")
+	f3()
+	defer print("f2-end ")
+}
+
+func f3() {
+	defer print("f3-begin ")
+	print("hello ")
+	defer print("f3-end ")
+}
+
+func main() {
+	f1()
+	println()
+}
+
+// Output:
+// hello f3-end f3-begin f2-end f2-begin f1-end f1-begin

_test/defer7.go

@@ -0,0 +1,18 @@
+package main
+
+import "fmt"
+
+func f1(in, out []string) {
+	defer copy(out, in)
+}
+
+func main() {
+	in := []string{"foo", "bar"}
+	out := make([]string, 2)
+	f1(in, out)
+
+	fmt.Println(out)
+}
+
+// Output:
+// [foo bar]

_test/defer8.go

@@ -0,0 +1,24 @@
+package main
+
+import "fmt"
+
+func f1(m map[string]string) {
+	defer delete(m, "foo")
+	defer delete(m, "test")
+
+	fmt.Println(m)
+}
+
+func main() {
+	m := map[string]string{
+		"foo": "bar",
+		"baz": "bat",
+	}
+	f1(m)
+
+	fmt.Println(m)
+}
+
+// Output:
+// map[baz:bat foo:bar]
+// map[baz:bat]

_test/defer9.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+func f1(ch chan string) {
+	defer close(ch)
+
+	ch <- "foo"
+}
+
+func main() {
+	ch := make(chan string, 1)
+	f1(ch)
+
+	for s := range ch {
+		fmt.Println(s)
+	}
+}
+
+// Output:
+// foo

_test/for10.go

@@ -0,0 +1,13 @@
+package main
+
+func main() {
+	for a := 0; false; {
+		println("nok", a)
+		a++
+		break
+	}
+	println("bye")
+}
+
+// Output:
+// bye

_test/for11.go

@@ -0,0 +1,14 @@
+package main
+
+func main() {
+	a := 0
+	for ; true; a++ {
+		println("nok", a)
+		break
+	}
+	println("bye", a)
+}
+
+// Output:
+// nok 0
+// bye 0

_test/for12.go

@@ -0,0 +1,12 @@
+package main
+
+func main() {
+	for a := 0; false; a++ {
+		println("nok", a)
+		break
+	}
+	println("bye")
+}
+
+// Output:
+// bye

_test/for13.go

@@ -0,0 +1,13 @@
+package main
+
+func main() {
+	a := 0
+	for ; false; a++ {
+		println("nok", a)
+		break
+	}
+	println("bye", a)
+}
+
+// Output:
+// bye 0

_test/for14.go

@@ -0,0 +1,16 @@
+package main
+
+func main() {
+	for a := 0; true; a++ {
+		println(a)
+		if a > 0 {
+			break
+		}
+	}
+	println("bye")
+}
+
+// Output:
+// 0
+// 1
+// bye

_test/for8.go

@@ -0,0 +1,18 @@
+package main
+
+func main() {
+	for i := 0; i < 4; i++ {
+		for {
+			break
+		}
+		if i == 1 {
+			continue
+		}
+		println(i)
+	}
+}
+
+// Output:
+// 0
+// 2
+// 3

_test/for9.go

@@ -0,0 +1,12 @@
+package main
+
+func main() {
+	for false {
+		println("nok")
+		break
+	}
+	println("bye")
+}
+
+// Output:
+// bye

_test/fun11.go

@@ -0,0 +1,12 @@
+package main
+
+var f F
+
+type F func(int)
+
+func main() {
+	println("ok")
+}
+
+// Output:
+// ok

_test/fun12.go

@@ -0,0 +1,12 @@
+package main
+
+func use(interface{}) {}
+
+func main() {
+	z := map[string]interface{}{"a": 5}
+	use(z)
+	println("bye")
+}
+
+// Output:
+// bye

_test/fun13.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+type T struct{}
+
+func newT() (T, error) { return T{}, nil }
+
+func main() {
+	var (
+		i   interface{}
+		err error
+	)
+	i, err = newT()
+	fmt.Println(i, err)
+}
+
+// Output:
+// {} <nil>

_test/fun14.go

@@ -0,0 +1,13 @@
+package main
+
+func f() (bool, int) { return true, 2 }
+
+func g() (bool, int) { return f() }
+
+func main() {
+	b, i := g()
+	println(b, i)
+}
+
+// Output:
+// true 2

_test/fun15.go

@@ -0,0 +1,11 @@
+package main
+
+func f1(a int) interface{} { return a + 1 }
+
+func main() {
+	c := f1(3)
+	println(c.(int))
+}
+
+// Output:
+// 4

_test/fun16.go

@@ -0,0 +1,13 @@
+package main
+
+func f1(a int) int { return a + 1 }
+
+func f2(a int) interface{} { return f1(a) }
+
+func main() {
+	c := f2(3)
+	println(c.(int))
+}
+
+// Output:
+// 4

_test/fun17.go

@@ -0,0 +1,13 @@
+package main
+
+func f1(a int) interface{} { return a + 1 }
+
+func f2(a int) interface{} { return f1(a) }
+
+func main() {
+	c := f2(3)
+	println(c.(int))
+}
+
+// Output:
+// 4

_test/fun18.go

@@ -0,0 +1,12 @@
+package main
+
+var m = map[string]int{"foo": 1, "bar": 2}
+
+func f(s string) interface{} { return m[s] }
+
+func main() {
+	println(f("foo").(int))
+}
+
+// Output:
+// 1

_test/fun19.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+)
+
+func foo() ([]string, error) {
+	return nil, fmt.Errorf("bar")
+}
+
+func main() {
+	a, b := foo()
+	fmt.Println(a, b)
+}
+
+// Output:
+// [] bar

_test/fun20.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+var myerr error = fmt.Errorf("bar")
+
+func ferr() error { return myerr }
+
+func foo() ([]string, error) {
+	return nil, ferr()
+}
+
+func main() {
+	a, b := foo()
+	fmt.Println(a, b)
+}
+
+// Output:
+// [] bar

_test/fun21.go

@@ -0,0 +1,12 @@
+package main
+
+func Bar() string {
+	return
+}
+
+func main() {
+	println(Bar())
+}
+
+// Error:
+// 4:2: not enough arguments to return

_test/fun22.go

@@ -0,0 +1,10 @@
+package main
+
+import "time"
+
+func main() {
+	time.Date()
+}
+
+// Error:
+// 6:2: not enough arguments in call to time.Date

_test/if3.go

@@ -0,0 +1,17 @@
+package main
+
+func main() {
+	a := 0
+	if false {
+		println("false")
+		a = 1
+	} else {
+		println("true")
+		a = -1
+	}
+	println(a)
+}
+
+// Output:
+// true
+// -1

_test/if4.go

@@ -0,0 +1,19 @@
+package main
+
+const bad = false
+
+func main() {
+	a := 0
+	if bad {
+		println("false")
+		a = 1
+	} else {
+		println("true")
+		a = -1
+	}
+	println(a)
+}
+
+// Output:
+// true
+// -1

_test/if5.go

@@ -0,0 +1,12 @@
+package main
+
+func main() {
+	if true {
+		println("ok")
+	}
+	println("bye")
+}
+
+// Output:
+// ok
+// bye

_test/if6.go

@@ -0,0 +1,11 @@
+package main
+
+func main() {
+	if false {
+		println("nok")
+	}
+	println("bye")
+}
+
+// Output:
+// bye

_test/if7.go

@@ -0,0 +1,15 @@
+package main
+
+func main() {
+	a := 0
+	b := false
+	if (b) {
+		a = 1
+	} else {
+		a = -1
+	}
+	println(a)
+}
+
+// Output:
+// -1

_test/imag0.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func f(c complex128) interface{} { return imag(c) }
+
+func main() {
+	c := complex(3, 2)
+	a := f(c)
+	fmt.Println(a.(float64))
+}
+
+// Output:
+// 2

_test/import8.go

@@ -0,0 +1,10 @@
+package main
+
+import "github.com/containous/yaegi/_test/b1/foo"
+
+func main() {
+	println(foo.Desc)
+}
+
+// Output:
+// in b1/foo

_test/import9.go

@@ -0,0 +1,10 @@
+package main
+
+import "github.com/containous/yaegi/_test/baz-bat"
+
+func main() {
+	println(baz.Name)
+}
+
+// Output:
+// baz-bat

_test/interface19.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+var I interface{}
+
+func main() {
+	fmt.Printf("%T %v\n", I, I)
+}
+
+// Output:
+// <nil> <nil>

_test/interface20.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	var a interface{}
+	a = string("A")
+	fmt.Println(a)
+}
+
+// Output:
+// A

_test/interface21.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := make([]interface{}, 1)
+	s[0] = 1
+	fmt.Println(s[0])
+}
+
+// Output:
+// 1

_test/interface22.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := make([]interface{}, 0)
+	s = append(s, 1)
+	fmt.Println(s[0])
+}
+
+// Output:
+// 1

_test/interface23.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	m := make(map[string]interface{})
+	m["A"] = string("A")
+	fmt.Println(m["A"])
+}
+
+// Output:
+// A

_test/interface24.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	m := make(map[string]interface{})
+	fmt.Println(m["B"])
+}
+
+// Output:
+// <nil>

_test/interface25.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	m := make(map[string]interface{})
+	m["A"] = 1
+	for _, v := range m {
+		fmt.Println(v)
+	}
+}
+
+// Output:
+// 1

_test/interface26.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := make([]interface{}, 0)
+	s = append(s, 1)
+	for _, v := range s {
+		fmt.Println(v)
+	}
+}
+
+// Output:
+// 1

_test/interface27.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+var errs = map[int]error{0: nil}
+
+func main() {
+	fmt.Println(errs)
+}
+
+// Output:
+// map[0:<nil>]

_test/interface28.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+var errs = []error{nil}
+
+func main() {
+	fmt.Println(errs)
+}
+
+// Output:
+// [<nil>]

_test/interface29.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	var a interface{}
+	println(a == nil)
+}
+
+// Output:
+// true

_test/interface30.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	var a interface{}
+	println(a != nil)
+}
+
+// Output:
+// false

_test/interface31.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := []interface{}{"test", 2}
+	fmt.Println(s[0], s[1])
+}
+
+// Output:
+// test 2

_test/interface32.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := [2]interface{}{"test", 2}
+	fmt.Println(s[0], s[1])
+}
+
+// Output:
+// test 2

_test/interface33.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	var a = map[string]interface{}{"test": "test"}
+	fmt.Println(a["test"])
+}
+
+// Output:
+// test

_test/interface34.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	s := [2]interface{}{1: "test", 0: 2}
+	fmt.Println(s[0], s[1])
+}
+
+// Output:
+// 2 test

_test/interface35.go

@@ -0,0 +1,15 @@
+package main
+
+import "fmt"
+
+type T struct {
+	I interface{}
+}
+
+func main() {
+	t := T{"test"}
+	fmt.Println(t)
+}
+
+// Output:
+// {test}

_test/interface36.go

@@ -0,0 +1,37 @@
+package main
+
+import "fmt"
+
+var (
+	t *S
+	_ I = t
+	_ J = t
+)
+
+type S struct {
+	Name string
+}
+
+func (s *S) F() int { return len(s.Name) }
+func (s *S) G() int { return s.F() }
+func (s *S) Ri() I  { return s }
+func (s *S) Rj() J  { return s }
+
+type J interface {
+	I
+	G() int
+	Rj() J
+}
+
+type I interface {
+	F() int
+	Ri() I
+}
+
+func main() {
+	var j J
+	fmt.Println(j)
+}
+
+// Output:
+// <nil>

_test/interface37.go

@@ -0,0 +1,23 @@
+package main
+
+type I interface {
+	A() string
+	B() string
+}
+
+type s struct{}
+
+func NewS() (I, error) {
+	return &s{}, nil
+}
+
+func (c *s) A() string { return "a" }
+func (c *s) B() string { return "b" }
+
+func main() {
+	s, _ := NewS()
+	println(s.A())
+}
+
+// Output:
+// a

_test/interface38.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+type foo struct {
+	bar string
+}
+
+func (f foo) String() string {
+	return "Hello from " + f.bar
+}
+
+func main() {
+	var f fmt.Stringer = foo{bar: "bar"}
+	fmt.Println(f)
+}
+
+// Output:
+// Hello from bar