1 files changed, 11 insertions, 2 deletions
diff --git a/compiler/stable_mir/src/mir/mono.rs b/compiler/stable_mir/src/mir/mono.rs
index 8562bfd3905..8c43f2c4b8f 100644
--- a/compiler/stable_mir/src/mir/mono.rs
+++ b/compiler/stable_mir/src/mir/mono.rs
@@ -1,7 +1,7 @@
 use crate::mir::Body;
 use crate::ty::{ClosureDef, ClosureKind, FnDef, GenericArgs, IndexedVal, Ty};
 use crate::{with, CrateItem, DefId, Error, ItemKind, Opaque};
-use std::fmt::Debug;
+use std::fmt::{Debug, Formatter};
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum MonoItem {
@@ -10,7 +10,7 @@ pub enum MonoItem {
     GlobalAsm(Opaque),
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Instance {
     /// The type of instance.
     pub kind: InstanceKind,
@@ -83,6 +83,15 @@ impl Instance {
     }
 }
 
+impl Debug for Instance {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Instance")
+            .field("kind", &self.kind)
+            .field("def", &self.mangled_name())
+            .finish()
+    }
+}
+
 /// Try to convert a crate item into an instance.
 /// The item cannot be generic in order to be converted into an instance.
 impl TryFrom<CrateItem> for Instance {