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-rw-r--r--src/ir/context.rs19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/ir/context.rs b/src/ir/context.rs
index 07731dde..5ebcfc28 100644
--- a/src/ir/context.rs
+++ b/src/ir/context.rs
@@ -135,6 +135,25 @@ item_id_newtype! {
unchecked = as_module_id_unchecked;
}
+item_id_newtype! {
+ /// An identifier for an `Item` whose `ItemKind` is known to be
+ /// `ItemKind::Var`.
+ pub struct VarId(ItemId)
+ where
+ /// Convert this `ItemId` into a `VarId` if its associated item is a var,
+ /// otherwise return `None`.
+ checked = as_var_id with is_var,
+
+ /// Convert this `ItemId` into a `VarId`.
+ ///
+ /// If this `ItemId` does not point to a var, then panic.
+ expected = expect_var_id,
+
+ /// Convert this `ItemId` into a `VarId` without actually checking whether
+ /// this id actually points to a `Var`.
+ unchecked = as_var_id_unchecked;
+}
+
impl From<ItemId> for usize {
fn from(id: ItemId) -> usize {
id.0