:art: Lexer performance

diff --git a/ast b/ast
index 91ecdc5d50c3cc4bcfa5a404d24115d26092ebcf..1e502b836600cac639114f775ef7227c43cf8db7 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 91ecdc5d50c3cc4bcfa5a404d24115d26092ebcf
+Subproject commit 1e502b836600cac639114f775ef7227c43cf8db7