Function count_local_id_uses

src/transform/src/normalize_lets.rs:240–245

Populates `counts` with the number of uses of each local identifier in `expr`.

(
        expr: &MirRelationExpr,
        counts: &mut std::collections::BTreeMap<LocalId, usize>,
    )

    /// Populates `counts` with the number of uses of each local identifier in `expr`.
    pub(super) fn count_local_id_uses(
        expr: &MirRelationExpr,
        counts: &mut std::collections::BTreeMap<LocalId, usize>,
    ) {
        for_local_id(expr, |i| *counts.entry(i).or_insert(0) += 1)
    }

    /// Visit `LetRec` stages and determine and update type information for `Get` nodes.
    ///