diff --git a/llvm/include/llvm/Demangle/RustDemangle.h b/llvm/include/llvm/Demangle/RustDemangle.h
--- a/llvm/include/llvm/Demangle/RustDemangle.h
+++ b/llvm/include/llvm/Demangle/RustDemangle.h
@@ -90,6 +90,7 @@
   void demangleType();
   void demangleFnSig();
   void demangleDynBounds();
+  void demangleDynTrait();
   void demangleOptionalBinder();
   void demangleConst();
   void demangleConstInt();
diff --git a/llvm/lib/Demangle/RustDemangle.cpp b/llvm/lib/Demangle/RustDemangle.cpp
--- a/llvm/lib/Demangle/RustDemangle.cpp
+++ b/llvm/lib/Demangle/RustDemangle.cpp
@@ -545,9 +545,18 @@
   SwapAndRestore<size_t> SaveBoundLifetimes(BoundLifetimes, BoundLifetimes);
   print("dyn ");
   demangleOptionalBinder();
-  // FIXME demangle {dyn-trait}
-  if (!consumeIf('E'))
-    Error = true;
+  for (size_t I = 0; !Error && !consumeIf('E'); ++I) {
+    if (I > 0)
+      print(" + ");
+    demangleDynTrait();
+  }
+}
+
+// <dyn-trait> = <path> {<dyn-trait-assoc-binding>}
+// <dyn-trait-assoc-binding> = "p" <undisambiguated-identifier> <type>
+void Demangler::demangleDynTrait() {
+  demanglePath(InType::Yes);
+  // FIXME demangle {<dyn-trait-assoc-binding>}
 }
 
 // Demangles optional binder and updates the number of bound lifetimes.
diff --git a/llvm/test/Demangle/rust.test b/llvm/test/Demangle/rust.test
--- a/llvm/test/Demangle/rust.test
+++ b/llvm/test/Demangle/rust.test
@@ -243,6 +243,15 @@
 CHECK: trait::<for<'a> fn(dyn for<'b> + 'a)>
        _RIC5traitFG_DG_EL0_EuE
 
+CHECK: trait::<dyn Display>
+       _RIC5traitDC7DisplayEL_E
+
+CHECK: trait::<dyn Display + Send + Sync>
+       _RIC5traitDC7DisplayC4SendC4SyncEL_E
+
+CHECK: trait::<dyn for<'a> Display>
+       _RIC5traitDG_C7DisplayEL_E
+
 ; Invalid trait object, missing lifetime.
 
 CHECK: _RIC5traitDEE