cmd/go: drop -example, apply -run to examples

Once more, with feeling.

R=golang-dev, gri
CC=golang-dev
http://codereview.appspot.com/5698080

src/cmd/go/test.go

@@ -99,11 +99,6 @@ directory containing the package sources, has its own flags:
 	    Run benchmarks matching the regular expression.
 	    By default, no benchmarks run.
 
-	-test.example pattern
-	    Run examples matching the regular expression.
-	    By default, all examples run, but if -test.run is set,
-	    no examples are run.
-
 	-test.cpuprofile cpu.out
 	    Write a CPU profile to the specified file before exiting.
 

src/cmd/go/testflag.go

@@ -28,7 +28,6 @@ var usageMessage = `Usage of go test:
   -benchtime=1: passes -test.benchtime to test
   -cpu="": passes -test.cpu to test
   -cpuprofile="": passes -test.cpuprofile to test
-  -example="": passes -test.example to test
   -memprofile="": passes -test.memprofile to test
   -memprofilerate=0: passes -test.memprofilerate to test
   -parallel=0: passes -test.parallel to test
@@ -68,7 +67,6 @@ var testFlagDefn = []*testFlagSpec{
 	{name: "benchtime", passToTest: true},
 	{name: "cpu", passToTest: true},
 	{name: "cpuprofile", passToTest: true},
-	{name: "example", passToTest: true},
 	{name: "memprofile", passToTest: true},
 	{name: "memprofilerate", passToTest: true},
 	{name: "parallel", passToTest: true},

src/pkg/testing/example.go

@@ -6,36 +6,30 @@ package testing
 
 import (
 	"bytes"
-	"flag"
 	"fmt"
 	"io"
 	"os"
 	"strings"
 	"time"
 )
 
-var matchExamples = flag.String("test.example", "", "regular expression to select examples to run")
-
 type InternalExample struct {
 	Name   string
 	F      func()
 	Output string
 }
 
 func RunExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ok bool) {
-	if *match != "" && *matchExamples == "" {
-		return // Don't run examples if testing is restricted: we're debugging.
-	}
 	ok = true
 
 	var eg InternalExample
 
 	stdout, stderr := os.Stdout, os.Stderr
 
 	for _, eg = range examples {
-		matched, err := matchString(*matchExamples, eg.Name)
+		matched, err := matchString(*match, eg.Name)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "testing: invalid regexp for -test.example: %s\n", err)
+			fmt.Fprintf(os.Stderr, "testing: invalid regexp for -test.run: %s\n", err)
 			os.Exit(1)
 		}
 		if !matched {

src/pkg/testing/testing.go

@@ -99,7 +99,7 @@ var (
 
 	// Report as tests are run; default is silent for success.
 	chatty         = flag.Bool("test.v", false, "verbose: print additional output")
-	match          = flag.String("test.run", "", "regular expression to select tests to run")
+	match          = flag.String("test.run", "", "regular expression to select tests and examples to run")
 	memProfile     = flag.String("test.memprofile", "", "write a memory profile to the named file after execution")
 	memProfileRate = flag.Int("test.memprofilerate", 0, "if >=0, sets runtime.MemProfileRate")
 	cpuProfile     = flag.String("test.cpuprofile", "", "write a cpu profile to the named file during execution")