by zr95.vip:

Before filing a bug, please check whether it has been fixed since the
latest release. Search the issue tracker and check that you're running the
latest version of Go:

Run "go version" and compare against
http://golang.org/doc/devel/release.html  If a newer version of Go exists,
install it and retry what you did to reproduce the problem.

Thanks.

What does 'go version' print?

go version go1.2.1 windows/amd64

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

1. Build the famous helloworld program on golang.org homepage.

package main

import "fmt"

func main() {
    fmt.Println("Hello, 世界")
}

And run go build. Suppose the executable is hello.exe.

2. In cmd or Windows Powershell (code page set to cp936):
  .\hello.exe | more
3. OR:
  .\hello.exe > a.txt
  type a.txt

What happened?

It prints:

Hello, 涓栫晫

What should have happened instead?

It should print:

Hello, 世界

Please provide any additional information below.

Only Non-Ascii characters are affected.

The output may vary with different code page settings.

Redirected outputs in cmd and Powershell are different:

.\hello.exe > a.txt

Run this in cmd, a.txt contains:

0000000: 4865 6c6c 6f2c 20e4 b896 e795 8c0a       Hello, .......

This is a valid UTF-8 string. The content is correct if a.txt viewed in editors
supporting UTF-8 encoding.

In Powershell, a.txt contains:

0000000: fffe 4800 6500 6c00 6c00 6f00 2c00 2000  ..H.e.l.l.o.,. .
0000010: 936d 2b68 6b66 0d00 0a00                 .m+hkf....

This is the UTF-8 output, treated as cp936, and encoded into UTF-16.

Problem also show up with godoc:

godoc math/cmplx Rect | more

then there's the problem displaying the symbol θ.