diff -r 08b83f91a1b2 -r 7bac6bd83cc3 src/HOL/Real_Asymp/multiseries_expansion.ML
--- a/src/HOL/Real_Asymp/multiseries_expansion.ML	Tue Mar 19 00:42:09 2024 +0100
+++ b/src/HOL/Real_Asymp/multiseries_expansion.ML	Tue Mar 19 13:24:22 2024 +0100
@@ -1627,7 +1627,7 @@
                         val _ = if get_verbose ectxt then 
                           writeln "Unsupported occurrence of arctan" else ()
                       in
-                        raise TERM ("Unsupported occurence of arctan", [])
+                        raise TERM ("Unsupported occurrence of arctan", [])
                       end)
               | _ => raise TERM ("Unexpected trim result during expansion of arctan", [])
           end