Am 06.03.21 um 18:27 schrieb Ævar Arnfjörð Bjarmason:

Do these sorts of rules really benefit that much from the type
v.s. expression? If yes we'll obviously need to support it, but if (and
I haven't looked closely) we can equally rewrite them with "expression"
(or it would be good enough) we could be quite a bit faster by
default...

Type information is essential for many (most?) semantic patches.
Untyped replacements could be done more easily using sed or similar.

René