1 files changed, 4 insertions, 0 deletions
diff --git a/source/slang/slang-check-decl.cpp b/source/slang/slang-check-decl.cpp
index 6083ce9c0..6a32f59d3 100644
--- a/source/slang/slang-check-decl.cpp
+++ b/source/slang/slang-check-decl.cpp
@@ -5638,6 +5638,10 @@ namespace Slang
             bool isDiffFunc = false;
             if (decl->hasModifier<ForwardDifferentiableAttribute>() || decl->hasModifier<BackwardDifferentiableAttribute>())
             {
+                if (GetOuterGeneric(decl))
+                {
+                    getSink()->diagnose(decl, Diagnostics::differentiableGenericInterfaceMethodNotSupported);
+                }
                 auto reqDecl = m_astBuilder->create<ForwardDerivativeRequirementDecl>();
                 cloneModifiers(reqDecl, decl);
                 auto declRef = DeclRef<CallableDecl>(decl, createDefaultSubstitutions(m_astBuilder, this, decl));