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* stdlib/awk.tl (sys:awk-compile-time): Slot field-names renamed to
field-name-conv.
(sys:awk-expander): Parse the new syntax which allows (sym fn)
pairs with optional fn, creating a list of normalized items
in the field-name-conv slot of the compile-time structure.
(sys:awk-symac-let): Adjust the code to the pair representation in
field-name-conv.
(sys:awk-field-name-code): New function for generating the
field conversion code.
(awk): Now that we have two optional pieces of code to wrap around
p-actions form, we factor that out of the awk-lambda, to a series
of conditional assignments. Here we handle the generation of the
field conversionns.
* conv.tl (sys:conv-expand-sym): New macro, used in
sys:awk-field-name-code and sys:conv-let.
(sys:conv-let): Simplify with sys:conv-expand-sym. Drop optional
argument from i; it connects with no documented feature, and is
not usable from fconv.
* tests/015/awk-fields.tl: New tests.
* txr.1: Updated, including cruft in fconv documentation.
Change-Id: Ie42819f58af039fdbcdb1ae365c89dc1add55c93
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