libgo: update to Go 1.13beta1 release

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

From-SVN: r275473

1 files changed, 64 insertions, 0 deletions

diff --git a/libgo/go/testing/run_example.go b/libgo/go/testing/run_example.go
new file mode 100644
index 0000000..10bde49
--- /dev/null
+++ b/libgo/go/testing/run_example.go
@@ -0,0 +1,64 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !js
+
+// TODO(@musiol, @odeke-em): re-unify this entire file back into
+// example.go when js/wasm gets an os.Pipe implementation
+// and no longer needs this separation.
+
+package testing
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"time"
+)
+
+func runExample(eg InternalExample) (ok bool) {
+	if *chatty {
+		fmt.Printf("=== RUN   %s\n", eg.Name)
+	}
+
+	// Capture stdout.
+	stdout := os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	os.Stdout = w
+	outC := make(chan string)
+	go func() {
+		var buf strings.Builder
+		_, err := io.Copy(&buf, r)
+		r.Close()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "testing: copying pipe: %v\n", err)
+			os.Exit(1)
+		}
+		outC <- buf.String()
+	}()
+
+	start := time.Now()
+
+	// Clean up in a deferred call so we can recover if the example panics.
+	defer func() {
+		timeSpent := time.Since(start)
+
+		// Close pipe, restore stdout, get output.
+		w.Close()
+		os.Stdout = stdout
+		out := <-outC
+
+		err := recover()
+		ok = eg.processRunResult(out, timeSpent, err)
+	}()
+
+	// Run example.
+	eg.F()
+	return
+}