effective_go.html: move and rework the blank identifier section
Also rename the relevant examples and make sure the working one compiles.
R=golang-dev, bradfitz, adg, iant, rsc
CC=golang-dev
https://golang.org/cl/7597043
diff --git a/doc/progs/eff_unused1.go b/doc/progs/eff_unused1.go
new file mode 100644
index 0000000..f990a19
--- /dev/null
+++ b/doc/progs/eff_unused1.go
@@ -0,0 +1,18 @@
+// skip
+
+package main
+
+import (
+ "fmt"
+ "io"
+ "log"
+ "os"
+)
+
+func main() {
+ fd, err := os.Open("test.go")
+ if err != nil {
+ log.Fatal(err)
+ }
+ // TODO: use fd.
+}
