Add ~replacement metafunction
#247
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This cooperates with `syntax-mark-original-neighbors` and `syntax-originally-neighbors?` to detect when two syntax objects weren't originally adjacent in the input syntax, but one (or both) of them is a drop-in replacements for input subforms that _were_ adjacent. This makes a lot of uses of `ORIGINAL-GAP` unnecessary, though sadly not all of them.
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The
~replacementmetafunction cooperates withsyntax-mark-original-neighborsandsyntax-originally-neighbors?to detect when two syntax objects weren't originally adjacent in the input syntax, but one (or both) of them is a drop-in replacements for input subforms that were adjacent. This makes a lot of uses ofORIGINAL-GAPunnecessary, though sadly not all of them.