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Adapt to Coq PR #18591: better refolding of List.app inducing "simpl never" now better respected #224

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Jun 17, 2024
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Adapt to Coq PR #18591: better refolding of List.app inducing "simpl never" now better respected #224

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4 changes: 2 additions & 2 deletions theories/StringRewriting/Reductions/MM2_ZERO_HALTING_to_SSTS01.v
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Original file line number Diff line number Diff line change
Expand Up @@ -603,7 +603,7 @@ Proof.
elim: u s.
- move=> [|y1 [|y2 s]].
+ rewrite ?app_nil_l. move=> <-. right. right. by exists [].
+ move=> [] <- <- /=. right. by left.
+ move=> []. rewrite [in [] ++ _]/List.app => <- <- /=. right. by left.
+ move=> [] <- <- ->. left. by exists s.
- move=> x1 u IH [|y1 s].
+ rewrite ?app_nil_l. move=> <-. right. right. by exists (x1 :: u).
Expand Down Expand Up @@ -707,7 +707,7 @@ Proof.
** rewrite app_nil_r /= ?map_app. move: (a) => [|?]; first done.
move=> Hi [] H1 [<-] H2.
move=> y [?] [/(mm2_instr_at_unique Hi) <-] Hxy.
inversion Hxy. subst.
inversion Hxy. subst. try rewrite [in LHS]/List.app in H1.
eexists (u' ++ [sz]), v', (_ :: _).
rewrite -?app_assoc. constructor; [done | by rewrite /= ?map_app H1 H2].
** rewrite ?map_app filter_app /= app_nil_r /step.
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