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* lib.c (obj_print_impl): Handle (dwim . atom) syntax
by printing [. atom]. Note that (dwim . @var)
and (dwim . @(expr)) already print as [. @var]
and [. @(expr)]; this is not new. But none of these
forms are supported by reading without the
accompanying change to the parser.
* parser.y (dwim): Handle the [. expr] and [ . expr]
syntax, so that forms like [. a] and [. @a] have
print-read consistency. The motivation is to be
able to [. @args] in pattern matching to match a
DWIM forms; I tried that and was surprised to have it
blow up in my face.
* tests/012/readprint.tl: New test file. Future
printer/parser changes will be tested here. Historically,
changes to the syntax have not been consistently
unit-tested.
* y.tab.c.shipped: Regenerated.
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