--- a/etc/settings Sun May 16 19:37:15 2021 +0200
+++ b/etc/settings Sun May 16 23:22:03 2021 +0200
@@ -16,7 +16,7 @@
ISABELLE_TOOL_JAVA_OPTIONS="-Djava.awt.headless=true -Xms512m -Xmx4g -Xss16m"
-ISABELLE_SCALAC_OPTIONS="-encoding UTF-8 -Wconf:cat=other-match-analysis:silent -feature -deprecation -target:11 -J-Xms512m -J-Xmx4g -J-Xss16m"
+ISABELLE_SCALAC_OPTIONS="-encoding UTF-8 -Wconf:cat=other-match-analysis:silent -feature -deprecation -target:11 -Xsource:3 -J-Xms512m -J-Xmx4g -J-Xss16m"
classpath "$ISABELLE_HOME/lib/classes/Pure.jar"