src/Pure/General/path.scala

--- a/src/Pure/General/path.scala	Thu Oct 20 23:46:49 2022 +0200
+++ b/src/Pure/General/path.scala	Fri Oct 21 11:08:01 2022 +0200
@@ -240,6 +240,7 @@
   def orig: Path = ext("orig")
   def patch: Path = ext("patch")
   def shasum: Path = ext("shasum")
+  def zst: Path = ext("zst")
 
   def backup: Path = {
     val (prfx, s) = split_path