diff --git a/src/librustc/middle/cstore.rs b/src/librustc/middle/cstore.rs
index 3cb827cdf6c3..50920ca7f7ea 100644
--- a/src/librustc/middle/cstore.rs
+++ b/src/librustc/middle/cstore.rs
@@ -250,8 +250,6 @@ pub trait CrateStore {
     fn item_body<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>, def: DefId)
                            -> &'tcx hir::Body;
 
-    fn is_item_mir_available(&self, def: DefId) -> bool;
-
     // This is basically a 1-based range of ints, which is a little
     // silly - I may fix that.
     fn crates(&self) -> Vec<CrateNum>;
@@ -399,10 +397,6 @@ impl CrateStore for DummyCrateStore {
         bug!("item_body")
     }
 
-    fn is_item_mir_available(&self, def: DefId) -> bool {
-        bug!("is_item_mir_available")
-    }
-
     // This is basically a 1-based range of ints, which is a little
     // silly - I may fix that.
     fn crates(&self) -> Vec<CrateNum> { vec![] }
diff --git a/src/librustc/ty/maps.rs b/src/librustc/ty/maps.rs
index 57a69c5fa0bb..3f18a480dd67 100644
--- a/src/librustc/ty/maps.rs
+++ b/src/librustc/ty/maps.rs
@@ -305,6 +305,13 @@ impl<'tcx> QueryDescription for queries::const_is_rvalue_promotable_to_static<'t
     }
 }
 
+impl<'tcx> QueryDescription for queries::is_item_mir_available<'tcx> {
+    fn describe(tcx: TyCtxt, def_id: DefId) -> String {
+        format!("checking if item is mir available: `{}`",
+            tcx.item_path_str(def_id))
+    }
+}
+
 macro_rules! define_maps {
     (<$tcx:tt>
      $($(#[$attr:meta])*
@@ -595,6 +602,7 @@ define_maps! { <'tcx>
 
     [] item_body_nested_bodies: metadata_dep_node(DefId) -> Rc<BTreeMap<hir::BodyId, hir::Body>>,
     [] const_is_rvalue_promotable_to_static: metadata_dep_node(DefId) -> bool,
+    [] is_item_mir_available: metadata_dep_node(DefId) -> bool,
 }
 
 fn coherent_trait_dep_node((_, def_id): (CrateNum, DefId)) -> DepNode<DefId> {
diff --git a/src/librustc/ty/mod.rs b/src/librustc/ty/mod.rs
index 8be3e4be7c8b..7d43e0d0659c 100644
--- a/src/librustc/ty/mod.rs
+++ b/src/librustc/ty/mod.rs
@@ -2332,7 +2332,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             return None;
         }
 
-        if !did.is_local() && !self.sess.cstore.is_item_mir_available(did) {
+        if !did.is_local() && !self.is_item_mir_available(did) {
             return None;
         }
 
diff --git a/src/librustc_metadata/cstore_impl.rs b/src/librustc_metadata/cstore_impl.rs
index a492e2afa4c7..f5a8accea280 100644
--- a/src/librustc_metadata/cstore_impl.rs
+++ b/src/librustc_metadata/cstore_impl.rs
@@ -126,6 +126,10 @@ provide! { <'tcx> tcx, def_id, cdata
         cdata.entry(def_id.index).ast.expect("const item missing `ast`")
             .decode(cdata).rvalue_promotable_to_static
     }
+    is_item_mir_available => {
+        !cdata.is_proc_macro(def_id.index) &&
+        cdata.maybe_entry(def_id.index).and_then(|item| item.decode(cdata).mir).is_some()
+    }
 }
 
 impl CrateStore for cstore::CStore {
@@ -443,11 +447,6 @@ impl CrateStore for cstore::CStore {
         self.get_crate_data(def_id.krate).item_body(tcx, def_id.index)
     }
 
-    fn is_item_mir_available(&self, def: DefId) -> bool {
-        self.dep_graph.read(DepNode::MetaData(def));
-        self.get_crate_data(def.krate).is_item_mir_available(def.index)
-    }
-
     fn crates(&self) -> Vec<CrateNum>
     {
         let mut result = vec![];
diff --git a/src/librustc_metadata/decoder.rs b/src/librustc_metadata/decoder.rs
index 2317c156b419..933166b05245 100644
--- a/src/librustc_metadata/decoder.rs
+++ b/src/librustc_metadata/decoder.rs
@@ -441,11 +441,11 @@ impl<'tcx> EntryKind<'tcx> {
 }
 
 impl<'a, 'tcx> CrateMetadata {
-    fn is_proc_macro(&self, id: DefIndex) -> bool {
+    pub fn is_proc_macro(&self, id: DefIndex) -> bool {
         self.proc_macros.is_some() && id != CRATE_DEF_INDEX
     }
 
-    fn maybe_entry(&self, item_id: DefIndex) -> Option<Lazy<Entry<'tcx>>> {
+    pub fn maybe_entry(&self, item_id: DefIndex) -> Option<Lazy<Entry<'tcx>>> {
         assert!(!self.is_proc_macro(item_id));
         self.root.index.lookup(self.blob.raw_bytes(), item_id)
     }
@@ -772,11 +772,6 @@ impl<'a, 'tcx> CrateMetadata {
         tcx.alloc_tables(ast.tables.decode((self, tcx)))
     }
 
-    pub fn is_item_mir_available(&self, id: DefIndex) -> bool {
-        !self.is_proc_macro(id) &&
-        self.maybe_entry(id).and_then(|item| item.decode(self).mir).is_some()
-    }
-
     pub fn maybe_get_item_mir(&self,
                               tcx: TyCtxt<'a, 'tcx, 'tcx>,
                               id: DefIndex)
diff --git a/src/librustc_trans/collector.rs b/src/librustc_trans/collector.rs
index 77155a474aed..786001161573 100644
--- a/src/librustc_trans/collector.rs
+++ b/src/librustc_trans/collector.rs
@@ -659,7 +659,7 @@ fn should_trans_locally<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, instance: &Instan
                 // in this crate
                 false
             } else {
-                if !tcx.sess.cstore.is_item_mir_available(def_id) {
+                if !tcx.is_item_mir_available(def_id) {
                     bug!("Cannot create local trans-item for {:?}", def_id)
                 }
                 true