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Title=__INCLUDE_LEVEL__

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This macro expands to a decimal integer constant that represents the
depth of nesting in include files.  The value of this macro is
incremented on every <CODE><A HREF="$$LINK(SEC6)">#include</A></CODE> directive and decremented at the
end of every included file.  It starts out at 0, its value within the
base file specified on the command line.
