diff --git a/mlir/lib/TableGen/AttrOrTypeDef.cpp b/mlir/lib/TableGen/AttrOrTypeDef.cpp
--- a/mlir/lib/TableGen/AttrOrTypeDef.cpp
+++ b/mlir/lib/TableGen/AttrOrTypeDef.cpp
@@ -85,19 +85,13 @@
                     "'assemblyFormat' or 'hasCustomAssemblyFormat' can only be "
                     "used when 'mnemonic' is set");
   }
-  // Assembly format parser requires builders with the same prototype
-  // as the default-builders.
-  // TODO: attempt to detect when a custom builder matches the prototype.
-  if (hasDeclarativeFormat && skipDefaultBuilders()) {
-    PrintWarning(getLoc(),
-                 "using 'assemblyFormat' with 'skipDefaultBuilders=1' may "
-                 "result in C++ compilation errors");
-  }
   // Assembly format printer requires accessors to be generated.
   if (hasDeclarativeFormat && !genAccessors()) {
     PrintFatalError(getLoc(),
                     "'assemblyFormat' requires 'genAccessors' to be true");
   }
+  // TODO: Ensure that a suitable builder prototype can be generated:
+  // https://llvm.org/PR56415
 }
 
 Dialect AttrOrTypeDef::getDialect() const {