croak "${name} already a known list" if $self->resolve($name);
my $path = find_path_for($name);
- my $tie = tie my @aliases, 'Tie::File', $config->{aliases};
+ my $tie = tie my @aliases, 'Tie::File', $config->{aliases}
+ or die "cannot tie " . $config->{aliases} . ": $!";
$tie->flock;
my @list_aliases = ($name, "${name}-request");