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* share/txr/stdlib/awk.tl (sys:awk%--rng, sys:awk%--rng-,
sys:awk%rng+, sys:awk%-rng+, sys:awk%--rng+): New functions.
(sys:awk-mac-let): Rewritten range expander. The four basic
ranges rng, rng-, -rng and -rng- are handled with in-line
expansion, because by doing that we avoid unnecessarily
evaluating the from-expression. The remaining cases expand
to function calls to the new functions, which receive the
flag vector, the index position in that vector and the values
of the from and to expressions. The behavior change is that
that the -- forms now do the right thing: they hide all
leading records that satisfy the from-expression, right to the
last record of the range if necessary.
* tests/015/awk-rng.expected: Updated.
* txr.1: Revise semantic description the -- range types, plus
minor fixes.
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