\unset ECHO

1|a template prepared in one autocommitted statement is gone by the next|b

2|within one explicit transaction the template is still there|b
3|gone once that transaction commits|b

4|also gone if that transaction rolls back instead|b

5|the unnamed default slot is transaction-scoped too|b

6|with pg_mustach.transaction off, the template survives across statements|b
7|and across an explicit transaction boundary|c
8|still there after that commit|d
t
ERROR:  unknown prepared mustach template "txn_session"