changed back type of corecursor for nested case, effectively reverting aa66ea552357 and 78a3d5006cf1
#!/bin/bash
set -e
FORMAT="$1"
VARIANT="$2"
"$ISABELLE_TOOL" logo Nitpick
cp "$ISABELLE_HOME/src/Doc/iman.sty" .
cp "$ISABELLE_HOME/src/Doc/manual.bib" .
"$ISABELLE_HOME/src/Doc/prepare_document" "$FORMAT"