diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index 87bcf8f40d7..e94d83f48a6 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -111,6 +111,38 @@ pub fn phase_index(&self) -> usize {
     }
 }
 
+/// Where a specific `mir::Body` comes from.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(HashStable, TyEncodable, TyDecodable, TypeFoldable)]
+pub struct MirSource<'tcx> {
+    pub instance: InstanceDef<'tcx>,
+
+    /// If `Some`, this is a promoted rvalue within the parent function.
+    pub promoted: Option<Promoted>,
+}
+
+impl<'tcx> MirSource<'tcx> {
+    pub fn item(def_id: DefId) -> Self {
+        MirSource {
+            instance: InstanceDef::Item(ty::WithOptConstParam::unknown(def_id)),
+            promoted: None,
+        }
+    }
+
+    pub fn from_instance(instance: InstanceDef<'tcx>) -> Self {
+        MirSource { instance, promoted: None }
+    }
+
+    pub fn with_opt_param(self) -> ty::WithOptConstParam<DefId> {
+        self.instance.with_opt_param()
+    }
+
+    #[inline]
+    pub fn def_id(&self) -> DefId {
+        self.instance.def_id()
+    }
+}
+
 /// The lowered representation of a single function.
 #[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable)]
 pub struct Body<'tcx> {
diff --git a/compiler/rustc_mir/src/transform/mod.rs b/compiler/rustc_mir/src/transform/mod.rs
index 67193814a40..41076f8e5d5 100644
--- a/compiler/rustc_mir/src/transform/mod.rs
+++ b/compiler/rustc_mir/src/transform/mod.rs
@@ -9,7 +9,7 @@
 use rustc_middle::mir::{traversal, Body, ConstQualifs, MirPhase, Promoted};
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::steal::Steal;
-use rustc_middle::ty::{self, InstanceDef, TyCtxt, TypeFoldable};
+use rustc_middle::ty::{self, TyCtxt, TypeFoldable};
 use rustc_span::{Span, Symbol};
 use std::borrow::Cow;
 
@@ -49,6 +49,8 @@
 pub mod unreachable_prop;
 pub mod validate;
 
+pub use rustc_middle::mir::MirSource;
+
 pub(crate) fn provide(providers: &mut Providers) {
     self::check_unsafety::provide(providers);
     *providers = Providers {
@@ -132,33 +134,6 @@ fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
     set
 }
 
-/// Where a specific `mir::Body` comes from.
-#[derive(Debug, Copy, Clone)]
-pub struct MirSource<'tcx> {
-    pub instance: InstanceDef<'tcx>,
-
-    /// If `Some`, this is a promoted rvalue within the parent function.
-    pub promoted: Option<Promoted>,
-}
-
-impl<'tcx> MirSource<'tcx> {
-    pub fn item(def_id: DefId) -> Self {
-        MirSource {
-            instance: InstanceDef::Item(ty::WithOptConstParam::unknown(def_id)),
-            promoted: None,
-        }
-    }
-
-    pub fn with_opt_param(self) -> ty::WithOptConstParam<DefId> {
-        self.instance.with_opt_param()
-    }
-
-    #[inline]
-    pub fn def_id(&self) -> DefId {
-        self.instance.def_id()
-    }
-}
-
 /// Generates a default name for the pass based on the name of the
 /// type `T`.
 pub fn default_name<T: ?Sized>() -> Cow<'static, str> {