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(parent: 410176a) | patch

Stage 14a: allow printing argv references.

Stage 14a: allow printing argv references.

* m4/m4module.h (m4_arg_print): New prototype.
(m4_symbol_value_print): Alter prototype.
* m4/input.c (struct input_funcs): Add parameter to peek_func.
(file_peek, builtin_peek, string_peek): Ignore new parameter.
(composite_peek): Ignore new parameter, for now.
(composite_clean, pop_input): Rework to minimize indirection, and
to avoid infinite recursion in next patch.
* m4/macro.c (trace_prepre, trace_pre): Adjust callers.
(m4_arg_print): New function.
* m4/symtab.c (m4_symbol_value_print): Update signature.
(m4_symbol_print): Update caller.
* m4/output.c (m4_shipout_string_trunc): Update comments.
* m4/syntax.c (set_quote_age): Require comma as argument separator
when dealing with $@ as a unit.
* tests/builtins.at (ifelse): Augment test.
* doc/m4.texinfo (Changesyntax): Document changesyntax deficiency.

Signed-off-by: Eric Blake <ebb9@byu.net>

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