Simplify some more code

check.go

@@ -120,10 +120,6 @@ type visitor struct {
 // passing its import path and the warnings found. Returns an error, if
 // any.
 func CheckArgs(args []string, onWarns func(string, []Warn)) error {
-	wd, err := os.Getwd()
-	if err != nil {
-		return err
-	}
 	paths := gotool.ImportPaths(args)
 	c := newCache()
 	rest, err := c.FromArgs(paths, false)
@@ -143,9 +139,11 @@ func CheckArgs(args []string, onWarns func(string, []Warn)) error {
 	}
 	v := &visitor{
 		cache: c,
-		wd:    wd,
 		fset:  prog.Fset,
 	}
+	if v.wd, err = os.Getwd(); err != nil {
+		return err
+	}
 	for _, pkg := range pkgs {
 		c.grabNames(pkg)
 		warns := v.checkPkg(prog.AllPackages[pkg])

generate/std/main.go

@@ -179,6 +179,6 @@ func main() {
 }
 
 func errExit(err error) {
-	fmt.Fprintf(os.Stderr, "%v\n", err)
+	fmt.Fprintln(os.Stderr, err)
 	os.Exit(1)
 }