2 files changed, 27 insertions, 0 deletions

diff --git a/crates/ra_hir_def/Cargo.toml b/crates/ra_hir_def/Cargo.toml
new file mode 100644
index 000000000..f22a678eb
--- /dev/null
+++ b/crates/ra_hir_def/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+edition = "2018"
+name = "ra_hir_def"
+version = "0.1.0"
+authors = ["rust-analyzer developers"]
+
+[dependencies]
+log = "0.4.5"
+
+ra_arena = { path = "../ra_arena" }
+ra_db = { path = "../ra_db" }
+ra_syntax = { path = "../ra_syntax" }
+ra_prof = { path = "../ra_prof" }
diff --git a/crates/ra_hir_def/src/lib.rs b/crates/ra_hir_def/src/lib.rs
new file mode 100644
index 000000000..f5dd2ae6f
--- /dev/null
+++ b/crates/ra_hir_def/src/lib.rs
@@ -0,0 +1,14 @@
+use ra_arena::{impl_arena_id, RawId};
+use ra_db::CrateId;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct ModuleId {
+    pub krate: CrateId,
+    pub module_id: CrateModuleId,
+}
+
+/// An ID of a module, **local** to a specific crate
+// FIXME: rename to `LocalModuleId`.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct CrateModuleId(RawId);
+impl_arena_id!(CrateModuleId);