libgo: update to Go 1.13beta1 release

    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/193497

From-SVN: r275473

1 files changed, 15 insertions, 0 deletions

diff --git a/libgo/go/net/mail/message.go b/libgo/go/net/mail/message.go
index 554377aa1da..e0907806ca6 100644
--- a/libgo/go/net/mail/message.go
+++ b/libgo/go/net/mail/message.go
@@ -342,6 +342,21 @@ func (p *addrParser) parseAddress(handleGroup bool) ([]*Address, error) {
 	}
 	// angle-addr = "<" addr-spec ">"
 	if !p.consume('<') {
+		atext := true
+		for _, r := range displayName {
+			if !isAtext(r, true, false) {
+				atext = false
+				break
+			}
+		}
+		if atext {
+			// The input is like "foo.bar"; it's possible the input
+			// meant to be "foo.bar@domain", or "foo.bar <...>".
+			return nil, errors.New("mail: missing '@' or angle-addr")
+		}
+		// The input is like "Full Name", which couldn't possibly be a
+		// valid email address if followed by "@domain"; the input
+		// likely meant to be "Full Name <...>".
 		return nil, errors.New("mail: no angle-addr")
 	}
 	spec, err = p.consumeAddrSpec()