:bug: Fix locale exp lexing

diff --git a/ast b/ast
index e09543b39ec51dc344d74dd2c1adb415957c6b5a..ff31aff0f531c0bcf4a8ed9e04bedd0a1eefe9ba 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit e09543b39ec51dc344d74dd2c1adb415957c6b5a
+Subproject commit ff31aff0f531c0bcf4a8ed9e04bedd0a1eefe9ba