// RUN: FileCheck -check-prefix=ANOTHER-PREFIX -input-file %s %s
// RUN: not FileCheck -check-prefix=PREFIX -input-file %s %s 2>&1 | FileCheck -check-prefix=CHECK-NONEXISTENT-PREFIX %s

foobar
; ANOTHER-PREFIX: foobar

; We use regex to match the colon so that FileCheck won't think it is a check
; prefix.
; CHECK-NONEXISTENT-PREFIX: error: no check strings found with prefix 'PREFIX{{:}}'