lean4-htt/tests/lean/run/eq_some_iff_get_eq_issue.lean at b2f70dad52dfd72975ab08c8b24d5d46f79e9d7b - max/lean4-htt - maxgit: wireguard access, git repository.

max/lean4-htt

Leonardo de Moura 45475d6434

feat: allow users to disable simpCtorEq simproc (#5167 )

`simp only` will not apply this simproc anymore. Users must now write
`simp only [reduceCtorEq]`. See RFC #5046 for motivation.
This PR also renames simproc to `reduceCtorEq`. 

close #5046 


@semorrison A few `simp only ...` tactics will probably break in
Mathlib. Fix: include `reduceCtorEq`.

2024-08-26 13:51:21 +00:00

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 namespace Option
 theorem eq_some_iff_get_eq' {o : Option α} {a : α} :
   o = some a ↔ ∃ h : o.isSome, Option.get _ h = a := by
   cases o; simp only [isSome_none, false_iff, reduceCtorEq]; intro h; cases h; contradiction
   simp [exists_prop]