NAME_MAX

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
version(none)
extern (C) nothrow @nogc
enum NAME_MAX = (!__traits(compiles, libressl_d.compat.limits.NAME_MAX)) ? (.FILENAME_MAX) : (libressl_d.compat.limits.NAME_MAX);

Meta