Make CONS, NIL, JUST and NOTHING constructors have uniform names
#3486
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ie any constructor with the `CONS` tag is replaced with `_builtin.CONS` Importantly, the tag for a `CONS` or `NIL` constructor is always 1 or 0 respectively. This allows the identity optimisation to apply to conversions between list shaped things
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Description
Any constructor with the
CONStag is replaced with_builtin.CONS, and similarly forNIL,JUSTandNOTHING.Importantly, the tag for a
CONSorNILconstructor is always 1 or 0 respectively.This allows the identity optimisation to apply to conversions between list shaped things (see #3482)
Should this change go in the CHANGELOG?
implementation, I have updated
CHANGELOG_NEXT.md(and potentially alsoCONTRIBUTORS.md).