reject further illegal chars according to https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
#!/usr/bin/env bash
#
# Author: Makarius
#
# Invoke ghc via "stack".
if [ -d "$ISABELLE_STACK_ROOT" ]; then
isabelle_stack ghc -- "$@"
else
echo "Cannot execute ghc: missing Isabelle GHC setup" >&2
exit 127
fi