feat: simproc for functions out of Subtype #5477
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Adds a simproc that will replace
l.map f
, wherel : {x // p x}
andf
syntactically only depends on the value, withl.map (f' ∘Subtype.val)
.In combination with
this allows us to automatically clear
attach
:(Credit to David and Joachim for suggesting this!)
TODO: add simprocs and simp lemmas for other higher order operations besides
map
.