libgo: update to Go1.13

    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194698

From-SVN: r275691

2 files changed, 0 insertions, 9 deletions

diff --git a/libgo/go/context/context.go b/libgo/go/context/context.go
index 05d01d0..6259085 100644
--- a/libgo/go/context/context.go
+++ b/libgo/go/context/context.go
@@ -49,7 +49,6 @@ package context
 
 import (
 	"errors"
-	"internal/oserror"
 	"internal/reflectlite"
 	"sync"
 	"time"
@@ -163,9 +162,6 @@ type deadlineExceededError struct{}
 func (deadlineExceededError) Error() string   { return "context deadline exceeded" }
 func (deadlineExceededError) Timeout() bool   { return true }
 func (deadlineExceededError) Temporary() bool { return true }
-func (deadlineExceededError) Is(target error) bool {
-	return target == oserror.ErrTimeout || target == oserror.ErrTemporary
-}
 
 // An emptyCtx is never canceled, has no values, and has no deadline. It is not
 // struct{}, since vars of this type must have distinct addresses.
diff --git a/libgo/go/context/context_test.go b/libgo/go/context/context_test.go
index 96ad146..b07a5cf 100644
--- a/libgo/go/context/context_test.go
+++ b/libgo/go/context/context_test.go
@@ -5,10 +5,8 @@
 package context
 
 import (
-	"errors"
 	"fmt"
 	"math/rand"
-	"os"
 	"runtime"
 	"strings"
 	"sync"
@@ -649,7 +647,4 @@ func XTestDeadlineExceededSupportsTimeout(t testingT) {
 	if !i.Timeout() {
 		t.Fatal("wrong value for timeout")
 	}
-	if !errors.Is(DeadlineExceeded, os.ErrTimeout) {
-		t.Fatal("errors.Is(DeadlineExceeded, os.ErrTimeout) = false, want true")
-	}
 }