# Coarse-grained or hierarchical dependencies

## 2024-10-09

Flip the default.

All fields are part of the identity of the tracked struct by default unless themselves tagged as `#[salsa::tracked]`.

## OLD

Basic idea is that you should be able to flag a tracked function to call it "coarse":

#[salsa::tracked(coarse)]
fn foo(db: &dyn crate::Db) {
    let x = TrackedStruct::new(...);
    let y = TrackedStruct::new(...);
}

If you mark a tracked struct as coarse,