SIGSEGV: segmentation violation with Cmd.Wait

[gopherbot]

by buttock.scout:

Before filing a bug, please check whether it has been fixed since
the latest release: run "hg pull -u" and retry what you did to
reproduce the problem.  Thanks.

What steps will reproduce the problem?
1. 6g -o gobuilder.o gobuilder.go && 6l -o gobuilder gobuilder.o
2. ./gobuilder -f gobuilder.go

What is the expected output? What do you see instead?
Formatting source file...
Error: 
Formatted source code

the actual output is attached as a .txt

What is your $GOOS?  $GOARCH?
darwin/amd64

Which revision are you using?  (hg identify)
4a3f8104324e tip

Please provide any additional information below.
I've attached both the source code and the error it displays, the .txt file
is UTF-8 encoded

Attachments:

1. gobuilder.go (1272 bytes)
2. bug.txt (831 bytes)

[gopherbot]

Comment 1 by buttock.scout:

I've updated and the issue still persists, I'm now at cf1a9b1f9bee tip and I've
included the latest bug.txt as an attachment.

Attachments:

1. bug.txt (814 bytes)

[rsc]

Comment 2:

You need to check err before using cmd.
cmd, err := exec.Run(...);
if err != nil {
    log.Error(err);
    return;
}
cmd.Wait(0);

Owner changed to r...@golang.org.

Status changed to Invalid.