more conservative update of Haskell stack (amending 04e54f57a869): 13.0 still lacks notable packages like "Agda" or "darcs";
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: raw ML process (interactive mode)
isabelle_admin_build jars || exit $?
eval "declare -a JAVA_ARGS=($ISABELLE_TOOL_JAVA_OPTIONS)"
mkdir -p "$ISABELLE_TMP_PREFIX" || exit $?
if type -p "$ISABELLE_LINE_EDITOR" > /dev/null
then
exec "$ISABELLE_LINE_EDITOR" isabelle java "${JAVA_ARGS[@]}" isabelle.ML_Console "$@"
else
echo "### No line editor: \"$ISABELLE_LINE_EDITOR\""
exec isabelle java "${JAVA_ARGS[@]}" isabelle.ML_Console "$@"
fi