! garble
stderr -count=1 'Usage of'
stderr '\tgo build'
! stdout .

! garble -h
stderr 'Usage of'
! stdout .

! garble -badflag
stderr 'Usage of'
! stdout .

! garble badcmd
stderr 'unknown command'

[!windows] ! garble /does/not/exist
[windows] ! garble C:\does\not\exist
stderr 'unknown tool'

[!windows] ! garble /does/not/exist/compile
[!windows] stderr 'no such file'
[windows] ! garble C:\does\not\exist\compile
[windows] stderr 'file does not exist'