|  | // RUN: not FileCheck -check-prefix=A! -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s | 
|  | // RUN: FileCheck -check-prefix=A1a-B_c -input-file %s %s | 
|  | // RUN: not FileCheck -check-prefix=REPEAT -check-prefix=REPEAT -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s | 
|  | // RUN: not FileCheck -check-prefix=VALID -check-prefix=A! -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s | 
|  | // RUN: not FileCheck -check-prefix= -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s | 
|  | foobar | 
|  | ; A1a-B_c: foobar | 
|  |  | 
|  | ; BAD_PREFIX: Supplied check-prefix is invalid! Prefixes must be | 
|  | unique and start with a letter and contain only alphanumeric characters, hyphens and underscores |