Function analyse_project_with_policy 

pub fn analyse_project_with_policy(
    roots: &Roots,
    overlay: &HashMap<PathBuf, String>,
    policy: StabilityPolicy,
    schema_lock: &SchemaLock,
) -> ProjectAnalysis

analyse_project under a given crate::stability::StabilityPolicy — how a test treats a shipped item as experimental, since none is yet.