Merge #968

968: Macro aware name resoltion r=matklad a=matklad

The first commit lays the ground work for new name resolution, including

* extracting position-indendent items from parse trees
* walking the tree of modules
* old-style macro_rules resolve

cc @pnkfelix: this looks like an API name resolution should interact with. 

Co-authored-by: Aleksey Kladov <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index e45a510b3..2b1001d48 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -124,6 +124,10 @@ impl CrateGraph {
         self.arena.is_empty()
     }
 
+    pub fn iter<'a>(&'a self) -> impl Iterator<Item = CrateId> + 'a {
+        self.arena.keys().map(|it| *it)
+    }
+
     pub fn crate_root(&self, crate_id: CrateId) -> FileId {
         self.arena[&crate_id].file_id
     }