by mkoistinen:

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. Run this code:
--- snip snip ---
package main
import . "fmt"

func main() {
    Printf("Test of Printf() string '+.3e': [%+.3e] [%+.3e] [%+.3e]\n", 0.0,
-1.5, 10000.5);
}
--- snip snip ---

Output should be: 
Test of Printf() string '+.3e': [0.000e+00] [-1.500e+00] [1.000e+04]

2. Notice the lack of the '+' sign in front of the returned 1st and 3rd values

3. Compare to specification in `man printf` on your system

What is the expected output? What do you see instead?
The output SHOULD be: 
... [+0.000e+00] [-1.500e+00] [+1.000e+04]

Also, same for the ' ' flag, which should put a space before positive
numbers instead of the '+' symbol above.

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


Which revision are you using?  (hg identify)
> hg identify
cb140bac9ab0 tip

Please provide any additional information below.

Sorry if this has already been fixed since this version, but I am working
on code for another system, and must maintain the same version locally as
the remote system.