llvm-project/llvm/test/tools/llvm-ifs/fail-file-open.test

# RUN: not llvm-ifs --output-ifs=%t.tbe %s.NotAFileInTestingDir 2>&1 | FileCheck %s

This file will not be read. An invalid file path is fed to llvm-ifs.

# CHECK: error: Could not open `{{.*}}.NotAFileInTestingDir`