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* share/txr/stdlib/txr-case.tl (txr-case-impl): If the input
is a stream, then convert it to a lazy list of lines, so that
running multiple functions against it produces sane,
backtracking behavior, like a @(cases) construct.
* tests/011/txr-case.expected: Updated.
* tests/011/txr-case.txr: Now actually contains a test case
for txr-case.
* txr.1: Address an issue reported by Paul A. Patience: the
input to match-fun, txr-if and txr-when may be a stream. That
has always been the case in the implementation. Also document
that when the input is a single string, it is treated as a
list. Document the new requirement in txr-case that a stream
is converted into lazy list of lines.
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