Jose E. Marchesi 1bf818e3fb a68: distinguish between NO_LOWERER and LOWERER_UNIMPL
Until now all the identifiers interned in A68_STANDENV were lowered by
using an explicit lowering routine.  This is because the entirely of
the standard preludes were implemented by having the compiler generate
the corresponding code inline.  We have a check in place to determine
whether a lowerer has been installed for a given standard construct:
NO_LOWERER.  This is a lowerer routine that just prints a message and
ICEs.

We want to write part of the standard preludes in Algol 68.  To make
that possible this patch introduces a distinction between NO_LOWERER,
meaning the definition comes from Algol 68 code in the runtime library
and therefore does not use a lowering routine, and LOWERER_UNIMPL,
which means the definition uses a lowering routine but a proper one
has not been written yet.

Signed-off-by: Jose E. Marchesi <jemarch@gnu.org>

gcc/algol68/ChangeLog

	* a68-types.h (NO_LOWERER): Redefine as NULL.
	(LOWERER_UNIMPL): Define.
	* a68-parser-prelude.cc (a68_idf): Use LOWERER_UNIMPL instead of
	NO_LOWERER.
	(a68_prio): Likewise.
	(a68_op): Likewise.
	* a68-low-units.cc (a68_lower_identifier): Do not assume
	declarations in A68_STANDENV all have lowerers.
	(a68_lower_formula): Likewise.
	(a68_lower_monadic_formula): Likewise.
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