Type Alias UnmountedStorageProber 

pub type UnmountedStorageProber = Box<dyn Fn(&str) -> Option<UnmountedMemStorage> + Send + Sync>;

Discovery hook: mem name → its storage, when the workspace layer can find any (None = no discoverable storage; the forward-reference mechanic governs, exactly as before). Boxed closure rather than a function pointer because discovery needs the workspace root and gitdir captured at boot.

Aliased Type

pub struct UnmountedStorageProber(/* private fields */);