Module expand 

Expansion (TeX: The Program §366–§401, with e-TeX and LuaTeX additions): expand, macro calls, \csname, \noexpand, \input.

Modules

cs_name_codes

cs_name modifiers.

Constants

EXPAND_DEPTH

Maximum expansion nesting before LuaTeX gives up.

RELAX_CHR

The modifier of \relax (LuaTeX uses one past the largest character).