Index: include/llvm/TableGen/Record.h
===================================================================
--- include/llvm/TableGen/Record.h
+++ include/llvm/TableGen/Record.h
@@ -1241,6 +1241,8 @@
   bool setValue(Init *V) {
     if (V) {
       Value = V->convertInitializerTo(getType());
+      assert(!Value || !isa<TypedInit>(Value) ||
+             cast<TypedInit>(Value)->getType()->typeIsConvertibleTo(getType()));
       return Value == nullptr;
     }
     Value = nullptr;
Index: lib/TableGen/Record.cpp
===================================================================
--- lib/TableGen/Record.cpp
+++ lib/TableGen/Record.cpp
@@ -478,6 +478,9 @@
   if (ListInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
     return I;
 
+  assert(Range.empty() || !isa<TypedInit>(Range[0]) ||
+         cast<TypedInit>(Range[0])->getType()->typeIsConvertibleTo(EltTy));
+
   void *Mem = Allocator.Allocate(totalSizeToAlloc<Init *>(Range.size()),
                                  alignof(ListInit));
   ListInit *I = new(Mem) ListInit(Range.size(), EltTy);