fix: remove unnecessary arg from builtin macros #734
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Providing "?a" as an argument means that it is removed from the prevar list after the macro is used, which removes a genuine ?a prevar which comes from a procedure argument for example. Since the argument is not required at all, just remove it. Also add tests of the builtin macros.
Manual entries for keepleft_, keepright_, takeleft_, takeright_.
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Providing "?a" as an argument means that it is removed from the prevar list after the macro is used, which removes a genuine ?a prevar which comes from a procedure argument for example. Since the argument is not required at all, just remove it.
Also add tests of the builtin macros.
The "new" builtin macros were also missing from the manual.
Closes #631