diff -r d892f6d66402 -r c7ab83a0c564 src/Pure/General/path.scala
--- a/src/Pure/General/path.scala	Wed Nov 11 21:00:14 2020 +0100
+++ b/src/Pure/General/path.scala	Wed Nov 11 21:04:22 2020 +0100
@@ -193,6 +193,7 @@
       prfx + Path.basic(s + "." + e)
     }
 
+  def xz: Path = ext("xz")
   def tex: Path = ext("tex")
   def pdf: Path = ext("pdf")