libgo: update to Go1.16beta1 release

This does not yet include support for the //go:embed directive added
in this release.

	* Makefile.am (check-runtime): Don't create check-runtime-dir.
	(mostlyclean-local): Don't remove check-runtime-dir.
	(check-go-tool, check-vet): Copy in go.mod and modules.txt.
	(check-cgo-test, check-carchive-test): Add go.mod file.
	* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/280172

1 files changed, 25 insertions, 9 deletions

diff --git a/libgo/go/net/http/request.go b/libgo/go/net/http/request.go
index 54ec1c5..adba540 100644
--- a/libgo/go/net/http/request.go
+++ b/libgo/go/net/http/request.go
@@ -15,7 +15,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime"
 	"mime/multipart"
 	"net"
@@ -175,6 +174,10 @@ type Request struct {
 	// but will return EOF immediately when no body is present.
 	// The Server will close the request body. The ServeHTTP
 	// Handler does not need to.
+	//
+	// Body must allow Read to be called concurrently with Close.
+	// In particular, calling Close should unblock a Read waiting
+	// for input.
 	Body io.ReadCloser
 
 	// GetBody defines an optional func to return a new copy of
@@ -540,6 +543,7 @@ var errMissingHost = errors.New("http: Request.Write on Request with no Host or
 
 // extraHeaders may be nil
 // waitForContinue may be nil
+// always closes body
 func (r *Request) write(w io.Writer, usingProxy bool, extraHeaders Header, waitForContinue func() bool) (err error) {
 	trace := httptrace.ContextClientTrace(r.Context())
 	if trace != nil && trace.WroteRequest != nil {
@@ -549,6 +553,15 @@ func (r *Request) write(w io.Writer, usingProxy bool, extraHeaders Header, waitF
 			})
 		}()
 	}
+	closed := false
+	defer func() {
+		if closed {
+			return
+		}
+		if closeErr := r.closeBody(); closeErr != nil && err == nil {
+			err = closeErr
+		}
+	}()
 
 	// Find the target host. Prefer the Host: header, but if that
 	// is not given, use the host from the request URL.
@@ -667,6 +680,7 @@ func (r *Request) write(w io.Writer, usingProxy bool, extraHeaders Header, waitF
 			trace.Wait100Continue()
 		}
 		if !waitForContinue() {
+			closed = true
 			r.closeBody()
 			return nil
 		}
@@ -679,6 +693,7 @@ func (r *Request) write(w io.Writer, usingProxy bool, extraHeaders Header, waitF
 	}
 
 	// Write body and trailer
+	closed = true
 	err = tw.writeBody(w)
 	if err != nil {
 		if tw.bodyReadError == err {
@@ -854,7 +869,7 @@ func NewRequestWithContext(ctx context.Context, method, url string, body io.Read
 	}
 	rc, ok := body.(io.ReadCloser)
 	if !ok && body != nil {
-		rc = ioutil.NopCloser(body)
+		rc = io.NopCloser(body)
 	}
 	// The host's colon:port should be normalized. See Issue 14836.
 	u.Host = removeEmptyPort(u.Host)
@@ -876,21 +891,21 @@ func NewRequestWithContext(ctx context.Context, method, url string, body io.Read
 			buf := v.Bytes()
 			req.GetBody = func() (io.ReadCloser, error) {
 				r := bytes.NewReader(buf)
-				return ioutil.NopCloser(r), nil
+				return io.NopCloser(r), nil
 			}
 		case *bytes.Reader:
 			req.ContentLength = int64(v.Len())
 			snapshot := *v
 			req.GetBody = func() (io.ReadCloser, error) {
 				r := snapshot
-				return ioutil.NopCloser(&r), nil
+				return io.NopCloser(&r), nil
 			}
 		case *strings.Reader:
 			req.ContentLength = int64(v.Len())
 			snapshot := *v
 			req.GetBody = func() (io.ReadCloser, error) {
 				r := snapshot
-				return ioutil.NopCloser(&r), nil
+				return io.NopCloser(&r), nil
 			}
 		default:
 			// This is where we'd set it to -1 (at least
@@ -1189,7 +1204,7 @@ func parsePostForm(r *Request) (vs url.Values, err error) {
 			maxFormSize = int64(10 << 20) // 10 MB is a lot of text.
 			reader = io.LimitReader(r.Body, maxFormSize+1)
 		}
-		b, e := ioutil.ReadAll(reader)
+		b, e := io.ReadAll(reader)
 		if e != nil {
 			if err == nil {
 				err = e
@@ -1383,10 +1398,11 @@ func (r *Request) wantsClose() bool {
 	return hasToken(r.Header.get("Connection"), "close")
 }
 
-func (r *Request) closeBody() {
-	if r.Body != nil {
-		r.Body.Close()
+func (r *Request) closeBody() error {
+	if r.Body == nil {
+		return nil
 	}
+	return r.Body.Close()
 }
 
 func (r *Request) isReplayable() bool {