Any macro can be called indirectly with
which results in a call to the macro name, which is passed the
rest of the arguments. This can be used to call macros with "illegal"
define allows such names to be defined):
define(`$$internal$macro', `Internal macro (name `$0')') => $$internal$macro =>$$internal$macro indir(`$$internal$macro') =>Internal macro (name $$internal$macro)
The point is, here, that larger macro packages can have private macros
defined, that will not be called by accident. They can only be
called through the builtin
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