From 9f4084278fd0038ef4deedab78ee4d7d2bc1a636 Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Wed, 1 Oct 2014 21:35:12 +0000
Subject: [PATCH] fmt: fix internal unknownType function This thing should
 never be called, but before 151960044 it was being called, incorrectly. This
 is now just a precaution but let's pretend it Fixes #8843 even though that
 was fixed by 151960044. The test case was already there and ran, another
 mystery.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/151970043
---
 src/fmt/print.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/fmt/print.go b/src/fmt/print.go
index 679c577dbd..de69e90fb7 100644
--- a/src/fmt/print.go
+++ b/src/fmt/print.go
@@ -297,13 +297,13 @@ func parsenum(s string, start, end int) (num int, isnum bool, newi int) {
 	return
 }
 
-func (p *pp) unknownType(v interface{}) {
-	if v == nil {
+func (p *pp) unknownType(v reflect.Value) {
+	if !v.IsValid() {
 		p.buf.Write(nilAngleBytes)
 		return
 	}
 	p.buf.WriteByte('?')
-	p.buf.WriteString(reflect.TypeOf(v).String())
+	p.buf.WriteString(v.Type().String())
 	p.buf.WriteByte('?')
 }
 
-- 
2.50.0