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empty-or-invalid-doc.yaml
# RUN: echo "" | not yaml2obj 2>&1 | FileCheck %s
# RUN: echo -n "" | not yaml2obj 2>&1 | FileCheck %s
# RUN: echo " " | not yaml2obj 2>&1 | FileCheck %s
# RUN: echo "  " | not yaml2obj 2>&1 | FileCheck %s
# CHECK: yaml2obj: error: unknown document type

# RUN: echo -e -n "\xff" | not yaml2obj 2>&1 | FileCheck %s --check-prefix=INVALID
# INVALID: yaml2obj: error: failed to parse YAML input