pub fn prop010_id_strategy(&self) -> impl Strategy<Value = &'g PackageId> + 'g {
        let members_by_name = &self.inner.members_by_name;
        self.prop010_name_strategy()
            .prop_map(move |name| &members_by_name[name])
    }
Returns a `Strategy` that generates random package IDs from this workspace.

Requires the `proptest1` feature to be enabled.

## Panics

Panics if there are no packages in this `Workspace`.
guppy/src/graph/proptest_helpers.rs