nan

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. alias nan = tango.stdc.math.nan
  2. alias nan = tango.stdc.math.nanf
  3. alias nan = tango.stdc.math.nanl
    version(!FreeBSD)
    extern (C)
    alias nan = tango.stdc.math.nanl

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