interp: fix processing of aliased types

For a long time, there was a confusion between aliased types and named types (due to my misunderstanding of alias types in Go at that time). The type category `aliasT` has been renamed into `linkedT`, which is correct semantically. 

Aliased types are only declared using `typeSpecAssign`, and its processing is now distinct from `typeSpec` statement, used for named types.

A `linkedT` type is obtained by a statement like `type A uint32`, where `A` type category is therefore `linkedT`.

An aliased type is obtained by a statement like `type A = uint32` (notice the `=` sign, translating into `typeSpecAssign`).

The semantic difference is that in the first linkedT form, `A` and `uint32` are 2 distinct types, instead of being strictly equivalent in the `typeSpecAssign` form (the 2 names lead to one type definition).


Fixes #1416.

.github/workflows/go-cross.yml

@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ 1.16, 1.17 ]
+        go-version: [ 1.18, 1.19 ]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
         include:
@@ -34,6 +34,7 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
+          stable: true
 
       # https://github.com/marketplace/actions/checkout
       - name: Checkout code
@@ -43,7 +44,7 @@ jobs:
 
       # https://github.com/marketplace/actions/cache
       - name: Cache Go modules
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           # In order:
           # * Module download cache

.github/workflows/main.yml

@@ -7,8 +7,8 @@ on:
   pull_request:
 
 env:
-  GO_VERSION: 1.17
-  GOLANGCI_LINT_VERSION: v1.42.1
+  GO_VERSION: 1.18
+  GOLANGCI_LINT_VERSION: v1.47.1
 
 jobs:
 
@@ -45,12 +45,13 @@ jobs:
     needs: linting
     strategy:
       matrix:
-        go-version: [ 1.16, 1.17 ]
+        go-version: [ 1.18, 1.19 ]
     steps:
       - name: Set up Go ${{ matrix.go-version }}
         uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
+          stable: true
 
       - name: Check out code
         uses: actions/checkout@v2
@@ -75,13 +76,14 @@ jobs:
         working-directory: ${{ github.workspace }}/go/src/github.com/traefik/yaegi
     strategy:
       matrix:
-        go-version: [ 1.16, 1.17 ]
+        go-version: [ 1.18, 1.19 ]
 
     steps:
       - name: Set up Go ${{ matrix.go-version }}
         uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
+          stable: true
 
       - name: Check out code
         uses: actions/checkout@v2
@@ -91,7 +93,7 @@ jobs:
 
       # https://github.com/marketplace/actions/cache
       - name: Cache Go modules
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ./_test/tmp
           key: ${{ runner.os }}-yaegi-${{ hashFiles('**//_test/tmp/') }}

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
       - v[0-9]+.[0-9]+*
 
 env:
-  GO_VERSION: 1.17
+  GO_VERSION: 1.19
 
 jobs:
 
@@ -26,7 +26,7 @@ jobs:
           fetch-depth: 0
 
       - name: Cache Go modules
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}

.golangci.toml

@@ -27,6 +27,7 @@
     "scopelint", # deprecated
     "interfacer", # deprecated
     "maligned", # deprecated
+    "exhaustivestruct", # deprecated
     "lll",
     "gas",
     "dupl",
@@ -49,10 +50,15 @@
     "wrapcheck",
     "nestif",
     "exhaustive",
-    "exhaustivestruct",
+    "exhaustruct",
     "forbidigo",
     "ifshort",
     "forcetypeassert",
+    "varnamelen",
+    "nosnakecase",
+    "nonamedreturns",
+    "nilnil",
+    "maintidx",
     "errorlint", # TODO: must be reactivate before fixes
   ]
 
@@ -81,3 +87,6 @@
   [[issues.exclude-rules]]
     path = "interp/interp_eval_test.go"
     linters = ["thelper"]
+  [[issues.exclude-rules]]
+    path = "interp/debugger.go"
+    linters = ["containedctx"]

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 1.16 and Go 1.17 (the latest 2 major releases)
+* Support Go 1.18 and Go 1.19 (the latest 2 major releases)
 
 ## Install
 

_test/alias3/alias3.go

@@ -1,9 +0,0 @@
-package alias3
-
-type T struct {
-	A string
-}
-
-func (t *T) Print() {
-	println(t.A)
-}

_test/assert2.go

@@ -5,8 +5,8 @@ import (
 	"sync"
 )
 
-// Defined an interface of stringBuilder that compatible with
-// strings.Builder(go 1.10) and bytes.Buffer(< go 1.10)
+// Define an interface of stringBuilder that is compatible with
+// strings.Builder(go 1.10) and bytes.Buffer(< go 1.10).
 type stringBuilder interface {
 	WriteRune(r rune) (n int, err error)
 	WriteString(s string) (int, error)

_test/assign17.go

@@ -0,0 +1,21 @@
+package main
+
+func main() {
+	s := make([]map[string]string, 0)
+	m := make(map[string]string)
+	m["m1"] = "m1"
+	m["m2"] = "m2"
+	s = append(s, m)
+	tmpStr := "start"
+	println(tmpStr)
+	for _, v := range s {
+		tmpStr, ok := v["m1"]
+		println(tmpStr, ok)
+	}
+	println(tmpStr)
+}
+
+// Output:
+// start
+// m1 true
+// start

_test/assign18.go

@@ -0,0 +1,21 @@
+package main
+
+func main() {
+	s := make([]map[string]string, 0)
+	m := make(map[string]string)
+	m["m1"] = "m1"
+	m["m2"] = "m2"
+	s = append(s, m)
+	tmpStr := "start"
+	println(tmpStr)
+	for _, v := range s {
+		tmpStr, _ := v["m1"]
+		println(tmpStr)
+	}
+	println(tmpStr)
+}
+
+// Output:
+// start
+// m1
+// start

_test/break0.go

@@ -0,0 +1,24 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+OuterLoop:
+	println("Boo")
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				break OuterLoop
+			case false:
+				println(foo)
+			}
+		}
+	}
+}
+
+// Error:
+// 15:5: invalid break label OuterLoop

_test/break1.go

@@ -0,0 +1,24 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+OuterLoop:
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				break OuterLoop
+			case false:
+				println(foo)
+			}
+		}
+	}
+}
+
+// Output:
+// I:  0
+// true

_test/break2.go

@@ -0,0 +1,25 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+OuterLoop:
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				break OuterLoop
+			case false:
+				println(foo)
+				continue OuterLoop
+			}
+		}
+	}
+}
+
+// Output:
+// I:  0
+// true

_test/break3.go

@@ -0,0 +1,27 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+	goto OuterLoop
+	println("Boo")
+OuterLoop:
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				break OuterLoop
+			case false:
+				println(foo)
+				goto OuterLoop
+			}
+		}
+	}
+}
+
+// Output:
+// I:  0
+// true

_test/cli1.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net"
 	"net/http"
@@ -13,7 +13,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli2.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net"
 	"net/http"
@@ -21,7 +21,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli3.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -13,7 +13,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli4.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -40,7 +40,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli5.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -40,7 +40,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli6.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -41,7 +41,7 @@ func client(uri string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/cli7.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"net/http/httptest"
+)
+
+type T struct {
+	http.ResponseWriter
+}
+
+type mw1 struct {
+}
+
+var obj = map[string]interface{}{}
+
+func (m *mw1) ServeHTTP(rw http.ResponseWriter, rq *http.Request) {
+	t := &T{
+		ResponseWriter: rw,
+	}
+	x := t.Header()
+	i := obj["m1"].(*mw1)
+	fmt.Fprint(rw, "Welcome to my website!", x, i)
+}
+
+func main() {
+	m1 := &mw1{}
+
+	obj["m1"] = m1
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", m1.ServeHTTP)
+
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client(server.URL)
+}
+
+func client(uri string) {
+	resp, err := http.Get(uri)
+	if err != nil {
+		log.Fatal(err)
+	}
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(body))
+}
+
+// Output:
+// Welcome to my website!map[] &{}

_test/cli8.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+)
+
+type T struct {
+	name string
+	next http.Handler
+}
+
+func (t *T) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	println("in T.ServeHTTP")
+	if t.next != nil {
+		t.next.ServeHTTP(rw, req)
+	}
+}
+
+func New(name string, next http.Handler) (http.Handler, error) { return &T{name, next}, nil }
+
+func main() {
+	next := func(rw http.ResponseWriter, req *http.Request) {
+		println("in next")
+	}
+
+	t, err := New("test", http.HandlerFunc(next))
+	if err != nil {
+		panic(err)
+	}
+
+	recorder := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	t.ServeHTTP(recorder, req)
+	println(recorder.Result().Status)
+}
+
+// Output:
+// in T.ServeHTTP
+// in next
+// 200 OK

_test/cont2.go

@@ -0,0 +1,26 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+OuterLoop:
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				continue OuterLoop
+			case false:
+				println(foo)
+			}
+		}
+	}
+}
+
+// Output:
+// I:  0
+// true
+// I:  1
+// true

_test/cont3.go

@@ -0,0 +1,24 @@
+package main
+
+func main() {
+	n := 2
+	m := 2
+	foo := true
+OuterLoop:
+	println("boo")
+	for i := 0; i < n; i++ {
+		println("I: ", i)
+		for j := 0; j < m; j++ {
+			switch foo {
+			case true:
+				println(foo)
+				continue OuterLoop
+			case false:
+				println(foo)
+			}
+		}
+	}
+}
+
+// Error:
+// 15:5: invalid continue label OuterLoop

_test/convert3.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func main() {
+	next := func(rw http.ResponseWriter, req *http.Request) {
+		rw.Header().Set("Cache-Control", "max-age=20")
+		rw.WriteHeader(http.StatusOK)
+	}
+	f := http.HandlerFunc(next)
+	fmt.Printf("%T\n", f.ServeHTTP)
+}
+
+// Output:
+// func(http.ResponseWriter, *http.Request)

_test/file_access.go

@@ -2,12 +2,11 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 )
 
 func main() {
-	file, err := ioutil.TempFile("", "yeagibench")
+	file, err := os.CreateTemp("", "yeagibench")
 	if err != nil {
 		panic(err)
 	}
@@ -23,7 +22,7 @@ func main() {
 		panic(err)
 	}
 
-	b, err := ioutil.ReadFile(file.Name())
+	b, err := os.ReadFile(file.Name())
 	if err != nil {
 		panic(err)
 	}

_test/gen1.go

@@ -0,0 +1,39 @@
+package main
+
+import "fmt"
+
+// SumInts adds together the values of m.
+func SumInts(m map[string]int64) int64 {
+	var s int64
+	for _, v := range m {
+		s += v
+	}
+	return s
+}
+
+// SumFloats adds together the values of m.
+func SumFloats(m map[string]float64) float64 {
+	var s float64
+	for _, v := range m {
+		s += v
+	}
+	return s
+}
+
+func main() {
+	// Initialize a map for the integer values
+	ints := map[string]int64{
+		"first":  34,
+		"second": 12,
+	}
+
+	// Initialize a map for the float values
+	floats := map[string]float64{
+		"first":  35.98,
+		"second": 26.99,
+	}
+
+	fmt.Printf("Non-Generic Sums: %v and %v\n",
+		SumInts(ints),
+		SumFloats(floats))
+}

_test/gen10.go

@@ -0,0 +1,12 @@
+package main
+
+func genFunc() (f func()) {
+	return f
+}
+
+func main() {
+	println(genFunc() == nil)
+}
+
+// Output:
+// true

_test/gen2.go

@@ -0,0 +1,34 @@
+package main
+
+import "fmt"
+
+// SumIntsOrFloats sums the values of map m. It supports both int64 and float64
+// as types for map values.
+func SumIntsOrFloats[K comparable, V int64 | float64](m map[K]V) V {
+	var s V
+	for _, v := range m {
+		s += v
+	}
+	return s
+}
+
+func main() {
+	// Initialize a map for the integer values
+	ints := map[string]int64{
+		"first":  34,
+		"second": 12,
+	}
+
+	// Initialize a map for the float values
+	floats := map[string]float64{
+		"first":  35.98,
+		"second": 26.99,
+	}
+
+	fmt.Printf("Generic Sums: %v and %v\n",
+		SumIntsOrFloats[string, int64](ints),
+		SumIntsOrFloats[string, float64](floats))
+}
+
+// Output:
+// Generic Sums: 46 and 62.97

_test/gen3.go

@@ -0,0 +1,22 @@
+package main
+
+type Number interface {
+	int | int64 | ~float64
+}
+
+func Sum[T Number](numbers []T) T {
+	var total T
+	for _, x := range numbers {
+		total += x
+	}
+	return total
+}
+
+func main() {
+	xs := []int{3, 5, 10}
+	total := Sum(xs)
+	println(total)
+}
+
+// Output:
+// 18

_test/gen4.go

@@ -0,0 +1,42 @@
+package main
+
+import "fmt"
+
+type List[T any] struct {
+	head, tail *element[T]
+}
+
+// A recursive generic type.
+type element[T any] struct {
+	next *element[T]
+	val  T
+}
+
+func (lst *List[T]) Push(v T) {
+	if lst.tail == nil {
+		lst.head = &element[T]{val: v}
+		lst.tail = lst.head
+	} else {
+		lst.tail.next = &element[T]{val: v}
+		lst.tail = lst.tail.next
+	}
+}
+
+func (lst *List[T]) GetAll() []T {
+	var elems []T
+	for e := lst.head; e != nil; e = e.next {
+		elems = append(elems, e.val)
+	}
+	return elems
+}
+
+func main() {
+	lst := List[int]{}
+	lst.Push(10)
+	lst.Push(13)
+	lst.Push(23)
+	fmt.Println("list:", lst.GetAll())
+}
+
+// Output:
+// list: [10 13 23]

_test/gen5.go

@@ -0,0 +1,24 @@
+package main
+
+import "fmt"
+
+type Set[Elem comparable] struct {
+	m map[Elem]struct{}
+}
+
+func Make[Elem comparable]() Set[Elem] {
+	return Set[Elem]{m: make(map[Elem]struct{})}
+}
+
+func (s Set[Elem]) Add(v Elem) {
+	s.m[v] = struct{}{}
+}
+
+func main() {
+	s := Make[int]()
+	s.Add(1)
+	fmt.Println(s)
+}
+
+// Output:
+// {map[1:{}]}

_test/gen6.go

@@ -0,0 +1,19 @@
+package main
+
+func MapKeys[K comparable, V any](m map[K]V) []K {
+	r := make([]K, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	return r
+}
+
+func main() {
+	var m = map[int]string{1: "2", 2: "4", 4: "8"}
+
+	// Test type inference
+	println(len(MapKeys(m)))
+}
+
+// Output:
+// 3

_test/gen7.go

@@ -0,0 +1,19 @@
+package main
+
+func MapKeys[K comparable, V any](m map[K]V) []K {
+	r := make([]K, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	return r
+}
+
+func main() {
+	var m = map[int]string{1: "2", 2: "4", 4: "8"}
+
+	// Test type inference
+	println(len(MapKeys))
+}
+
+// Error:
+// invalid argument for len

_test/gen8.go

@@ -0,0 +1,15 @@
+package main
+
+type Float interface {
+	~float32 | ~float64
+}
+
+func add[T Float](a, b T) float64 { return float64(a) + float64(b) }
+
+func main() {
+	var x, y int = 1, 2
+	println(add(x, y))
+}
+
+// Error:
+// int does not implement main.Float

_test/gen9.go

@@ -0,0 +1,14 @@
+package main
+
+type Float interface {
+	~float32 | ~float64
+}
+
+func add[T Float](a, b T) float64 { return float64(a) + float64(b) }
+
+func main() {
+	println(add(1, 2))
+}
+
+// Error:
+// untyped int does not implement main.Float

_test/io2.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"strings"
 )
@@ -10,7 +10,7 @@ import (
 func main() {
 	r := strings.NewReader("Go is a general-purpose language designed with systems programming in mind.")
 
-	b, err := ioutil.ReadAll(r)
+	b, err := io.ReadAll(r)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/issue-1187.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 )
 
@@ -13,7 +12,7 @@ type sink interface {
 
 func newSink() sink {
 	// return os.Stdout	// Stdout is special in yaegi tests
-	file, err := ioutil.TempFile("", "yaegi-test.*")
+	file, err := os.CreateTemp("", "yaegi-test.*")
 	if err != nil {
 		panic(err)
 	}

_test/issue-1260.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 )
 
@@ -37,7 +36,7 @@ func (s *Sink2) Close() error                { println("in Close", s.name); retu
 func newS2(name string) Sink                 { return Sink1{name} }
 
 func main() {
-	tmpfile, err := ioutil.TempFile("", "xxx")
+	tmpfile, err := os.CreateTemp("", "xxx")
 	if err != nil {
 		panic(err)
 	}

_test/issue-1311.go

@@ -0,0 +1,19 @@
+package main
+
+type T struct {
+	v interface{}
+}
+
+func f() (ret int64, err error) {
+	ret += 2
+	return
+}
+
+func main() {
+	t := &T{}
+	t.v, _ = f()
+	println(t.v.(int64))
+}
+
+// Output:
+// 2

_test/issue-1315.go

@@ -0,0 +1,32 @@
+package main
+
+type Intf interface {
+	M()
+}
+
+type T struct {
+	s string
+}
+
+func (t *T) M() { println("in M") }
+
+func f(i interface{}) {
+	switch j := i.(type) {
+	case Intf:
+		j.M()
+	default:
+		println("default")
+	}
+}
+
+func main() {
+	var i Intf
+	var k interface{} = 1
+	i = &T{"hello"}
+	f(i)
+	f(k)
+}
+
+// Output:
+// in M
+// default

_test/issue-1320.go

@@ -0,0 +1,29 @@
+package main
+
+type Pooler interface {
+	Get() string
+}
+
+type baseClient struct {
+	connPool Pooler
+}
+
+type connPool struct {
+	name string
+}
+
+func (c *connPool) Get() string { return c.name }
+
+func newBaseClient(i int, p Pooler) *baseClient {
+	return &baseClient{connPool: p}
+}
+
+func newConnPool() *connPool { return &connPool{name: "connPool"} }
+
+func main() {
+	b := newBaseClient(0, newConnPool())
+	println(b.connPool.(*connPool).name)
+}
+
+// Output:
+// connPool

_test/issue-1326.go

@@ -0,0 +1,42 @@
+package main
+
+type Option interface {
+	apply(*T)
+}
+
+type T struct {
+	s string
+}
+
+type opt struct {
+	name string
+}
+
+func (o *opt) apply(t *T) {
+	println(o.name)
+}
+
+func BuildOptions() []Option {
+	return []Option{
+		&opt{"opt1"},
+		&opt{"opt2"},
+	}
+}
+
+func NewT(name string, options ...Option) *T {
+	t := &T{name}
+	for _, opt := range options {
+		opt.apply(t)
+	}
+	return t
+}
+
+func main() {
+	t := NewT("hello", BuildOptions()...)
+	println(t.s)
+}
+
+// Output:
+// opt1
+// opt2
+// hello

_test/issue-1328.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+)
+
+func main() {
+	script := "hello"
+	sumRaw := sha1.Sum([]byte(script))
+	sum := hex.EncodeToString(sumRaw[:])
+	println(sum)
+}
+
+// Output:
+// aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

_test/issue-1330.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net"
+)
+
+type wrappedConn struct {
+	net.Conn
+}
+
+func main() {
+	_, err := net.Listen("tcp", "127.0.0.1:49153")
+	if err != nil {
+		panic(err)
+	}
+
+	dialer := &net.Dialer{
+		LocalAddr: &net.TCPAddr{
+			IP:   net.ParseIP("127.0.0.1"),
+			Port: 0,
+		},
+	}
+
+	conn, err := dialer.Dial("tcp", "127.0.0.1:49153")
+	if err != nil {
+		panic(err)
+	}
+	defer conn.Close()
+
+	t := &wrappedConn{conn}
+	var w io.Writer = t
+	if n, err := w.Write([]byte("hello")); err != nil {
+		fmt.Println(err)
+	} else {
+		fmt.Println(n)
+	}
+}
+
+// Output:
+// 5

_test/issue-1332.go

@@ -0,0 +1,17 @@
+package main
+
+func run(fn func(name string)) { fn("test") }
+
+type T2 struct {
+	name string
+}
+
+func (t *T2) f(s string) { println(s, t.name) }
+
+func main() {
+	t2 := &T2{"foo"}
+	run(t2.f)
+}
+
+// Output:
+// test foo

_test/issue-1333.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+)
+
+func mock(name string) http.HandlerFunc {
+	return func(rw http.ResponseWriter, req *http.Request) {
+		fmt.Fprint(rw, "Hello ", name)
+	}
+}
+
+func client(uri string) {
+	resp, err := http.Get(uri)
+	if err != nil {
+		panic(err)
+	}
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(string(body))
+}
+
+func main() {
+	mux := http.NewServeMux()
+	server := httptest.NewServer(mux)
+	defer server.Close()
+	mux.Handle("/", mock("foo"))
+	client(server.URL)
+}
+
+// Output:
+// Hello foo

_test/issue-1337.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"io"
+	"os"
+)
+
+func f(i interface{}) {
+	switch at := i.(type) {
+	case int, int8:
+		println("integer", at)
+	case io.Reader:
+		println("reader")
+	}
+	println("bye")
+}
+
+func main() {
+	var fd *os.File
+	var r io.Reader = fd
+	f(r)
+}
+
+// Output:
+// reader
+// bye

_test/issue-1342.go

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

_test/issue-1344.go

@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+func main() {
+	var m = map[string]interface{}{"a": "a"}
+	a, _ := m["a"]
+	b, ok := a.(string)
+	fmt.Println("a:", a, ", b:", b, ", ok:", ok)
+}
+
+// Output:
+// a: a , b: a , ok: true

_test/issue-1354.go

@@ -0,0 +1,21 @@
+package main
+
+func main() {
+	println(test()) // Go prints true, Yaegi false
+}
+
+func test() bool {
+	if true {
+		goto label
+	}
+	goto label
+label:
+	println("Go continues here")
+	return true
+	println("Yaegi goes straight to this return (this line is never printed)")
+	return false
+}
+
+// Output:
+// Go continues here
+// true

_test/issue-1355.go

@@ -0,0 +1,22 @@
+package main
+
+import "github.com/traefik/yaegi/_test/p2"
+
+func f(i interface{}) {
+	_, ok := i.(p2.I)
+	println("ok:", ok)
+}
+
+func main() {
+	var v *p2.T
+	var i interface{}
+
+	i = v
+	_, ok := i.(p2.I)
+	println("ok:", ok)
+	f(v)
+}
+
+// Output:
+// ok: true
+// ok: true

_test/issue-1360.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	. "net"
+)
+
+func main() {
+	v := IP{}
+	fmt.Println(v)
+}
+
+// Output:
+// <nil>

_test/issue-1361.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+type obj struct {
+	num float64
+}
+
+type Fun func(o *obj) (r *obj, err error)
+
+func numFun(fn func(f float64) float64) Fun {
+	return func(o *obj) (*obj, error) {
+		return &obj{fn(o.num)}, nil
+	}
+}
+
+func main() {
+	f := numFun(math.Cos)
+	r, err := f(&obj{})
+	fmt.Println(r, err)
+}
+
+// Output:
+// &{1} <nil>

_test/issue-1364.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func main() {
+	var value interface{}
+	var err error
+	value, err = strconv.ParseFloat("123", 64)
+	fmt.Println(value, err)
+}
+
+// Output:
+// 123 <nil>

_test/issue-1365.go

@@ -0,0 +1,18 @@
+package main
+
+func genInt() (int, error) { return 3, nil }
+
+func getInt() (value int) {
+	value, err := genInt()
+	if err != nil {
+		panic(err)
+	}
+	return
+}
+
+func main() {
+	println(getInt())
+}
+
+// Output:
+// 3

_test/issue-1368.go

@@ -0,0 +1,16 @@
+package main
+
+const dollar byte = 36
+
+func main() {
+	var c byte = 36
+	switch true {
+	case c == dollar:
+		println("ok")
+	default:
+		println("not ok")
+	}
+}
+
+// Output:
+// ok

_test/issue-1371.go

@@ -0,0 +1,18 @@
+package main
+
+import "fmt"
+
+type node struct {
+	parent *node
+	child  []*node
+	key    string
+}
+
+func main() {
+	root := &node{key: "root"}
+	root.child = nil
+	fmt.Println("root:", root)
+}
+
+// Output:
+// root: &{<nil> [] root}

_test/issue-1373.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+	"go/ast"
+)
+
+func NewBadExpr() ast.Expr {
+	return &ast.BadExpr{}
+}
+
+func main() {
+	fmt.Printf("%T\n", NewBadExpr().(*ast.BadExpr))
+}
+
+// Output:
+// *ast.BadExpr

_test/issue-1375.go

@@ -0,0 +1,38 @@
+package main
+
+import "fmt"
+
+type Option func(*Struct)
+
+func WithOption(opt string) Option {
+	return func(s *Struct) {
+		s.opt = opt
+	}
+}
+
+type Struct struct {
+	opt string
+}
+
+func New(opts ...Option) *Struct {
+	s := new(Struct)
+	for _, opt := range opts {
+		opt(s)
+	}
+	return s
+}
+
+func (s *Struct) ShowOption() {
+	fmt.Println(s.opt)
+}
+
+func main() {
+	opts := []Option{
+		WithOption("test"),
+	}
+	s := New(opts...)
+	s.ShowOption()
+}
+
+// Output:
+// test

_test/issue-1378.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	t, err := time.Parse(time.RFC3339, "2006-01-02T15:04:05Z")
+	if err != nil {
+		panic(err)
+	}
+	fn := func() error {
+		_, err := t.GobEncode()
+		return err
+	}
+	fmt.Println(fn())
+}
+
+// Output:
+// <nil>

_test/issue-1381.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+)
+
+func main() {
+	var bufPtrOne *bytes.Buffer
+	var bufPtrTwo *bytes.Buffer
+	var bufPtrThree *bytes.Buffer
+	var bufPtrFour *bytes.Buffer
+
+	for i := 0; i < 2; i++ {
+		bufOne := bytes.Buffer{}
+		bufTwo := &bytes.Buffer{}
+		var bufThree bytes.Buffer
+		bufFour := new(bytes.Buffer)
+
+		if bufPtrOne == nil {
+			bufPtrOne = &bufOne
+		} else if bufPtrOne == &bufOne {
+			fmt.Println("bufOne was not properly redeclared")
+		} else {
+			fmt.Println("bufOne is properly redeclared")
+		}
+
+		if bufPtrTwo == nil {
+			bufPtrTwo = bufTwo
+		} else if bufPtrTwo == bufTwo {
+			fmt.Println("bufTwo was not properly redeclared")
+		} else {
+			fmt.Println("bufTwo is properly redeclared")
+		}
+
+		if bufPtrThree == nil {
+			bufPtrThree = &bufThree
+		} else if bufPtrThree == &bufThree {
+			fmt.Println("bufThree was not properly redeclared")
+		} else {
+			fmt.Println("bufThree is properly redeclared")
+		}
+
+		if bufPtrFour == nil {
+			bufPtrFour = bufFour
+		} else if bufPtrFour == bufFour {
+			fmt.Println("bufFour was not properly redeclared")
+		} else {
+			fmt.Println("bufFour is properly redeclared")
+		}
+	}
+}
+
+// Output:
+// bufOne is properly redeclared
+// bufTwo is properly redeclared
+// bufThree is properly redeclared
+// bufFour is properly redeclared

_test/issue-1404.go

@@ -0,0 +1,22 @@
+package main
+
+type I interface {
+	inI()
+}
+
+type T struct {
+	name string
+}
+
+func (t *T) inI() {}
+
+func main() {
+	var i I = &T{name: "foo"}
+
+	if i, ok := i.(*T); ok {
+		println(i.name)
+	}
+}
+
+// Output:
+// foo

_test/issue-1408.go

@@ -0,0 +1,16 @@
+package main
+
+type (
+	Number  = int32
+	Number2 = Number
+)
+
+func f(n Number2) { println(n) }
+
+func main() {
+	var n Number = 5
+	f(n)
+}
+
+// Output:
+// 5

_test/issue-1411.go

@@ -0,0 +1,16 @@
+package main
+
+type Number int32
+
+func (n Number) IsValid() bool { return true }
+
+type Number1 = Number
+
+type Number2 = Number1
+
+func main() {
+	a := Number2(5)
+	println(a.IsValid())
+}
+
+// Output: true

_test/issue-1416.go

@@ -0,0 +1,17 @@
+package main
+
+type Number int32
+
+type Number1 = Number
+
+type Number2 = Number1
+
+func (n Number2) IsValid() bool { return true }
+
+func main() {
+	a := Number(5)
+	println(a.IsValid())
+}
+
+// Output:
+// true

_test/issue-1421.go

@@ -0,0 +1,9 @@
+package main
+
+type Number = int
+
+func main() {
+	println(Number(1) < int(2))
+}
+
+// Output: true

_test/issue-1425.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+type WrappedReader struct {
+	reader io.Reader
+}
+
+func (wr WrappedReader) Read(p []byte) (n int, err error) {
+	return wr.reader.Read(p)
+}
+
+// Of course, this implementation is completely stupid because it does not write
+// to the intended writer, as any honest WriteTo implementation should. its
+// implemtion is just to make obvious the divergence of behaviour with yaegi.
+func (wr WrappedReader) WriteTo(w io.Writer) (n int64, err error) {
+	// Ignore w, send to Stdout to prove whether this WriteTo is used.
+	data, err := io.ReadAll(wr)
+	if err != nil {
+		return 0, err
+	}
+	nn, err := os.Stdout.Write(data)
+	return int64(nn), err
+}
+
+func main() {
+	f := strings.NewReader("hello world")
+	wr := WrappedReader{reader: f}
+
+	// behind the scenes, io.Copy is supposed to use wr.WriteTo if the implementation exists.
+	// With Go, it works as expected, i.e. the output is sent to os.Stdout.
+	// With Yaegi, it doesn't, i.e. the output is sent to io.Discard.
+	if _, err := io.Copy(io.Discard, wr); err != nil {
+		log.Fatal(err)
+	}
+}
+
+// Output:
+// hello world

_test/issue-1439.go

@@ -0,0 +1,25 @@
+package main
+
+type Transformer interface {
+	Reset()
+}
+
+type Encoder struct {
+	Transformer
+}
+
+type nop struct{}
+
+func (nop) Reset() { println("Reset") }
+
+func f(e Transformer) {
+	e.Reset()
+}
+
+func main() {
+	e := Encoder{Transformer: nop{}}
+	f(e)
+}
+
+// Output:
+// Reset

_test/issue-1442.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+)
+
+func main() {
+	ctx, _ := context.WithCancel(context.Background())
+	ch := make(chan string, 20)
+	defer close(ch)
+
+	go func(ctx context.Context, ch <-chan string) {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case tmp := <-ch:
+				_ = tmp
+			}
+		}
+	}(ctx, ch)
+
+	for _, i := range "abcdef" {
+		for _, j := range "0123456789" {
+			// i, j := "a", "0"
+			for _, k := range "ABCDEF" {
+				select {
+				case <-ctx.Done():
+					return
+				default:
+					tmp := string(i) + string(j) + string(k)
+					ch <- tmp
+				}
+			}
+		}
+	}
+	return
+}
+
+// Output:
+//

_test/issue-1447.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+type I interface {
+	Name() string
+}
+
+type S struct {
+	iMap map[string]I
+}
+
+func main() {
+	s := S{}
+	s.iMap = map[string]I{}
+	fmt.Println(s)
+}
+
+// Output:
+// {map[]}

_test/issue-1451.go

@@ -0,0 +1,19 @@
+package main
+
+type t1 uint8
+
+const (
+	n1 t1 = iota
+	n2
+)
+
+type T struct {
+	elem [n2 + 1]int
+}
+
+func main() {
+	println(len(T{}.elem))
+}
+
+// Output:
+// 2

_test/issue-1454.go

@@ -0,0 +1,22 @@
+package main
+
+type I2 interface {
+	I2() string
+}
+
+type I interface {
+	I2
+}
+
+type S struct{}
+
+func (*S) I2() string { return "foo" }
+
+func main() {
+	var i I
+	_, ok := i.(*S)
+	println(ok)
+}
+
+// Output:
+// false

_test/issue-1459.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+type funclistItem func()
+
+type funclist struct {
+	list []funclistItem
+}
+
+func main() {
+	funcs := funclist{}
+
+	funcs.list = append(funcs.list, func() { fmt.Println("first") })
+
+	for _, f := range funcs.list {
+		f()
+	}
+}
+
+// Output:
+// first

_test/issue-1460.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"reflect"
+)
+
+func unmarshalJSON[T any](b []byte, x *[]T) error {
+	if *x != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	return json.Unmarshal(b, x)
+}
+
+type StructView[T any] interface {
+	Valid() bool
+	AsStruct() T
+}
+
+type SliceView[T ViewCloner[T, V], V StructView[T]] struct {
+	ж []T
+}
+
+type ViewCloner[T any, V StructView[T]] interface {
+	View() V
+	Clone() T
+}
+
+func SliceOfViews[T ViewCloner[T, V], V StructView[T]](x []T) SliceView[T, V] {
+	return SliceView[T, V]{x}
+}
+
+func (v SliceView[T, V]) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *SliceView[T, V]) UnmarshalJSON(b []byte) error { return unmarshalJSON(b, &v.ж) }
+
+type Slice[T any] struct {
+	ж []T
+}
+
+func (v Slice[T]) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *Slice[T]) UnmarshalJSON(b []byte) error { return unmarshalJSON(b, &v.ж) }
+
+func SliceOf[T any](x []T) Slice[T] {
+	return Slice[T]{x}
+}
+
+type viewStruct struct {
+	Int        int
+	Strings    Slice[string]
+	StringsPtr *Slice[string] `json:",omitempty"`
+}
+
+func main() {
+	ss := SliceOf([]string{"bar"})
+	in := viewStruct{
+		Int:        1234,
+		Strings:    ss,
+		StringsPtr: &ss,
+	}
+
+	var buf bytes.Buffer
+	encoder := json.NewEncoder(&buf)
+	encoder.SetIndent("", "")
+	err1 := encoder.Encode(&in)
+	b := buf.Bytes()
+	var got viewStruct
+	err2 := json.Unmarshal(b, &got)
+	println(err1 == nil, err2 == nil, reflect.DeepEqual(got, in))
+}
+
+// Output:
+// true true true

_test/issue-1465.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+)
+
+func SomeFunc[T int | string](defaultValue T) T {
+	switch v := any(&defaultValue).(type) {
+	case *string:
+		*v = *v + " abc"
+	case *int:
+		*v -= 234
+	}
+	return defaultValue
+}
+
+func main() {
+	fmt.Println(SomeFunc("test"))
+	fmt.Println(SomeFunc(1234))
+}
+
+// Output:
+// test abc
+// 1000

_test/issue-1466.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+)
+
+func SomeFunc(defaultValue interface{}) interface{} {
+	switch v := defaultValue.(type) {
+	case string:
+		return v + " abc"
+	case int:
+		return v - 234
+	}
+	panic("whoops")
+}
+
+func main() {
+	fmt.Println(SomeFunc(1234))
+	fmt.Println(SomeFunc("test"))
+}
+
+// Output:
+// 1000
+// test abc

_test/issue-1470.go

@@ -0,0 +1,15 @@
+package main
+
+type T struct {
+	num [tnum + 2]int
+}
+
+const tnum = 23
+
+func main() {
+	t := T{}
+	println(len(t.num))
+}
+
+// Output:
+// 25

_test/issue-1475.go

@@ -0,0 +1,12 @@
+package main
+
+type T uint16
+
+func f() T { return 0 }
+
+func main() {
+	println(f())
+}
+
+// Output:
+// 0

_test/issue-435.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type Foo int
+
+func (f Foo) String() string {
+	return "foo-" + strconv.Itoa(int(f))
+}
+
+func print1(arg interface{}) {
+	fmt.Println(arg)
+}
+
+func main() {
+	var arg Foo = 3
+	var f = print1
+	f(arg)
+}
+
+// Output:
+// foo-3

_test/issue-558.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"strings"
 )
@@ -36,7 +35,7 @@ type pipe struct {
 
 func newReadAutoCloser(r io.Reader) readAutoCloser {
 	if _, ok := r.(io.Closer); !ok {
-		return readAutoCloser{ioutil.NopCloser(r)}
+		return readAutoCloser{io.NopCloser(r)}
 	}
 	return readAutoCloser{r.(io.ReadCloser)}
 }
@@ -44,7 +43,7 @@ func newReadAutoCloser(r io.Reader) readAutoCloser {
 func main() {
 	p := &pipe{}
 	p.Reader = newReadAutoCloser(strings.NewReader("test"))
-	b, err := ioutil.ReadAll(p.Reader)
+	b, err := io.ReadAll(p.Reader)
 	if err != nil {
 		log.Fatal(err)
 	}

_test/named3.go

@@ -1,6 +1,6 @@
 package main
 
-import "github.com/traefik/yaegi/_test/alias3"
+import "github.com/traefik/yaegi/_test/named3"
 
 var globalT *T
 
@@ -8,10 +8,10 @@ func init() {
 	globalT = &T{A: "test"}
 }
 
-type T alias3.T
+type T named3.T
 
 func (t *T) PrintT() {
-	(*alias3.T)(t).Print()
+	(*named3.T)(t).Print()
 }
 
 func main() {

_test/named3/named3.go

@@ -0,0 +1,31 @@
+package named3
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type T struct {
+	A string
+}
+
+func (t *T) Print() {
+	println(t.A)
+}
+
+type A http.Header
+
+func (a A) ForeachKey() error {
+	for k, vals := range a {
+		for _, v := range vals {
+			fmt.Println(k, v)
+		}
+
+	}
+
+	return nil
+}
+
+func (a A) Set(k string, v []string) {
+	a[k] = v
+}

_test/named4.go

@@ -17,11 +17,23 @@ func (b B) Test2() {
 	fmt.Println("test2")
 }
 
+func (b B) Test3() {
+	for k, vals := range b {
+		for _, v := range vals {
+			fmt.Println(k, v)
+		}
+	}
+}
+
 func main() {
 	b := B{}
 
 	b.Test2()
+	b["test"] = []string{"a", "b"}
+	b.Test3()
 }
 
 // Output:
 // test2
+// test a
+// test b

_test/os0.go

@@ -2,11 +2,11 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 )
 
 func main() {
-	_, err := ioutil.ReadFile("__NotExisting__")
+	_, err := os.ReadFile("__NotExisting__")
 	if err != nil {
 		fmt.Println(err.Error())
 	}

_test/p2/p2.go

@@ -0,0 +1,9 @@
+package p2
+
+type I interface {
+	isI()
+}
+
+type T struct{}
+
+func (t *T) isI() {}

_test/p4/p4.go

@@ -0,0 +1,3 @@
+package p4
+
+var Value1 = "value1"

_test/p5.go

@@ -0,0 +1,10 @@
+package main
+
+import "github.com/traefik/yaegi/_test/p5"
+
+func main() {
+	println(*p5.Value1)
+}
+
+// Output:
+// value1

_test/p5/p5.go

@@ -0,0 +1,8 @@
+package p5
+
+import "github.com/traefik/yaegi/_test/p4"
+
+var (
+	Value1 = &val1
+	val1   = p4.Value1
+)

_test/select1.go

@@ -10,11 +10,11 @@ func main() {
 	c2 := make(chan string)
 
 	go func() {
-		time.Sleep(1e7)
+		time.Sleep(1e8)
 		c1 <- "one"
 	}()
 	go func() {
-		time.Sleep(2e7)
+		time.Sleep(2e8)
 		c2 <- "two"
 	}()
 

_test/select14.go

@@ -6,8 +6,8 @@ import (
 )
 
 const (
-	period    = 100 * time.Millisecond
-	precision = 7 * time.Millisecond
+	period    = 300 * time.Millisecond
+	precision = 30 * time.Millisecond
 )
 
 func main() {

_test/struct49.go

@@ -25,7 +25,7 @@ func main() {
 	}
 	s.ts["test"] = append(s.ts["test"], &T{s: s})
 
-	t , ok:= s.getT("test")
+	t, ok := s.getT("test")
 	println(t != nil, ok)
 }
 

_test/switch39.go

@@ -0,0 +1,17 @@
+package main
+
+func f(params ...interface{}) {
+	switch p0 := params[0].(type) {
+	case string:
+		println("string:", p0)
+	default:
+		println("not a string")
+	}
+}
+
+func main() {
+	f("Hello")
+}
+
+// Output:
+// string: Hello

_test/switch40.go

@@ -0,0 +1,17 @@
+package main
+
+func f(params ...interface{}) {
+	switch params[0].(type) {
+	case string:
+		println("a string")
+	default:
+		println("not a string")
+	}
+}
+
+func main() {
+	f("Hello")
+}
+
+// Output:
+// a string

_test/type24.go

@@ -43,6 +43,6 @@ func assertValue() {
 }
 
 // Output:
-// interface conversion: interface {} is int, not string
-// interface conversion: interface {} is nil, not string
-// interface conversion: *httptest.ResponseRecorder is not http.Pusher: missing method Push
+// 22:10: interface conversion: interface {} is int, not string
+// 32:10: interface conversion: interface {} is nil, not string
+// 42:10: interface conversion: *httptest.ResponseRecorder is not http.Pusher: missing method Push

_test/var16.go

@@ -0,0 +1,19 @@
+package main
+
+func getArray() ([]int, error) { println("getArray"); return []int{1, 2}, nil }
+
+func getNum() (int, error) { println("getNum"); return 3, nil }
+
+func main() {
+	if a, err := getNum(); err != nil {
+		println("#1", a)
+	} else if a, err := getArray(); err != nil {
+		println("#2", a)
+	}
+	println("#3")
+}
+
+// Output:
+// getNum
+// getArray
+// #3

cmd/yaegi/run.go

@@ -4,7 +4,6 @@ import (
 	"flag"
 	"fmt"
 	"go/build"
-	"io/ioutil"
 	"os"
 	"reflect"
 	"strconv"
@@ -135,7 +134,7 @@ func isFile(path string) bool {
 }
 
 func runFile(i *interp.Interpreter, path string, noAutoImport bool) error {
-	b, err := ioutil.ReadFile(path)
+	b, err := os.ReadFile(path)
 	if err != nil {
 		return err
 	}