Avoid use of `firstorder`.

787636f5 · Robbert Krebbers · faace489 · 787636f5
Commit 787636f5 authored Apr 07, 2019 by Robbert Krebbers
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theories/bi/big_op.v theories/bi/big_op.v +2 -2

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--- a/theories/bi/big_op.v
+++ b/theories/bi/big_op.v
@@ -934,8 +934,8 @@ Section map2.
    - apply and_elim_r.
    - rewrite <- (left_id True%I (∧)%I (Φ i x1 x2)).
      apply and_mono=>//. apply pure_mono=>_ k.
-      rewrite !lookup_insert_is_Some' !lookup_empty.
-      firstorder.
+      rewrite !lookup_insert_is_Some' !lookup_empty -!not_eq_None_Some.
+      naive_solver.
  Qed.

  Lemma big_sepM2_fmap {A' B'} (f : A → A') (g : B → B') (Φ : nat → A' → B' → PROP) m1 m2 :