LLVMVerifyFunction with char **OutMessage output argument

we have:
LLVMBool LLVMVerifyModule (LLVMModuleRef M, LLVMVerifierFailureAction Action, char **OutMessage)
LLVMBool LLVMVerifyFunction (LLVMValueRef Fn, LLVMVerifierFailureAction Action)

Is there any reason LLVMVerifyFunction can’t have OutMessage output argument to allow caller what to do with error message?