--- a/src/HOL/Tools/Meson/meson.ML Thu Aug 07 20:33:28 2025 +0200
+++ b/src/HOL/Tools/Meson/meson.ML Thu Aug 07 21:40:03 2025 +0200
@@ -543,7 +543,7 @@
"Let_def [abs_def]". *)
fun nnf_ss simp_options =
simpset_of (put_simpset HOL_basic_ss \<^context>
- addsimps (nnf_extra_simps simp_options)
+ |> Simplifier.add_simps (nnf_extra_simps simp_options)
|> fold Simplifier.add_proc
[\<^simproc>\<open>defined_All\<close>, \<^simproc>\<open>defined_Ex\<close>, \<^simproc>\<open>neq\<close>, \<^simproc>\<open>let_simp\<close>])