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1# In python's re.sub patterns, '%{3}' means three '%%%'. If we permitted that2# as a substitution name (and escaped it before recording it as a3# substitution), it would be confusing if someone tried to use the same name in4# a lit configuration file, where the pattern isn't escaped automatically.5 6# DEFINE: %{3} = value7# RUN: echo %{3}8 9# CHECK: Substitution name '%{3}' is malformed {{.*}}10# CHECK-NEXT: in {{DEFINE}}: directive on test line [[#@LINE-4]]11 12# CHECK: Unresolved: 1 {{\([0-9]*.[0-9]*%\)}}13