the bool asdl type died a while ago
diff --git a/Parser/asdl.py b/Parser/asdl.py
index c90d2e2..01a8b5e 100644
--- a/Parser/asdl.py
+++ b/Parser/asdl.py
@@ -228,7 +228,7 @@
" field ::= Id ? "
return Field(type[0], opt=True)
-builtin_types = ("identifier", "string", "bytes", "int", "bool", "object")
+builtin_types = ("identifier", "string", "bytes", "int", "object")
# below is a collection of classes to capture the AST of an AST :-)
# not sure if any of the methods are useful yet, but I'm adding them