builtin: document print and println
Fixes #5787.
R=r
CC=golang-dev
https://golang.org/cl/11057043
diff --git a/src/pkg/builtin/builtin.go b/src/pkg/builtin/builtin.go
index 128a1b5..51550a4 100644
--- a/src/pkg/builtin/builtin.go
+++ b/src/pkg/builtin/builtin.go
@@ -236,6 +236,19 @@
// panicking.
func recover() interface{}
+// The print built-in function formats its arguments in an implementation-
+// specific way and writes the result to standard error.
+// Print is useful for bootstrapping and debugging; it is not guaranteed
+// to stay in the language.
+func print(args ...Type)
+
+// The println built-in function formats its arguments in an implementation-
+// specific way and writes the result to standard error.
+// Spaces are always added between arguments and a newline is appended.
+// Println is useful for bootstrapping and debugging; it is not guaranteed
+// to stay in the language.
+func println(args ...Type)
+
// The error built-in interface type is the conventional interface for
// representing an error condition, with the nil value representing no error.
type error interface {
