| // RUN: FileCheck -check-prefix=ANOTHER-PREFIX -input-file %s %s | 
 | // RUN: %ProtectFileCheckOutput not FileCheck -check-prefix=PREFIX1 -check-prefix=PREFIX2 -input-file %s %s 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK-NONEXISTENT-PREFIX -check-prefix=ALSO-NONEXISTENT -allow-unused-prefixes %s | 
 | // RUN: %ProtectFileCheckOutput not FileCheck -check-prefixes=PREFIX1,PREFIX2 -input-file %s %s 2>&1 | FileCheck -strict-whitespace -check-prefixes=CHECK-NONEXISTENT-PREFIX,ALSO-NONEXISTENT -allow-unused-prefixes %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 prefixes 'PREFIX1{{:}}', 'PREFIX2{{:}}' |