feat: add option for ext to flatten structure fields #122
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This has come up in the mathlib port: zulip, in particular in leanprover-community/mathlib4#3360
here we would like the generated
ext
-lemma to bex.toProd = y.toProd → x = y
instead of(x.toProd.fst = y.toProd.fst) → (x.toProd.snd = y.toProd.snd) → x = y
.The suggested syntax is
@[ext (flat := false)]
for not flattening structure fields. The default value istrue
which keeps flattening them as it currently does.