feat: support yaegi in go playground

.travis.yml

@@ -36,7 +36,7 @@ before_script:
 script:
   - make check
   - go build -v ./...
-  - GO111MODULE=off go test -v ./...
+  - make tests
 
 deploy:
   - provider: script

Makefile

@@ -16,4 +16,7 @@ cmd/goexports/goexports: cmd/goexports/goexports.go
 generate: gen_all_syscall
 	go generate
 
+tests:
+	GO111MODULE=off go test -v ./...
+
 .PHONY: check gen_all_syscall gen_tests

interp/interp.go

@@ -123,7 +123,7 @@ type Options struct {
 // New returns a new interpreter
 func New(options Options) *Interpreter {
 	i := Interpreter{
-		opt:      opt{goPath: getGoPath(options)},
+		opt:      opt{goPath: options.GoPath},
 		fset:     token.NewFileSet(),
 		universe: initUniverse(),
 		scopes:   map[string]*scope{},
@@ -143,18 +143,6 @@ func New(options Options) *Interpreter {
 	return &i
 }
 
-func getGoPath(options Options) string {
-	if options.GoPath != "" {
-		return options.GoPath
-	}
-
-	goPath, err := os.Executable()
-	if err != nil {
-		panic(err)
-	}
-	return goPath
-}
-
 func initUniverse() *scope {
 	sc := &scope{global: true, sym: map[string]*symbol{
 		// predefined Go types