From 945409c4c6871c18aad24086c594cc66b5913733 Mon Sep 17 00:00:00 2001
From: Sai Praveen Bangaru <31557731+saipraveenb25@users.noreply.github.com>
Date: Thu, 17 Aug 2023 14:45:13 -0400
Subject: Initial support for differentiating existential types (#3111)

* Merge

* WIP: Complete auto-diff logic for existential types

* Revert "Add compiler option for generating representative hash"

This reverts commit 13b09ef4621e73844c96d64d9c111a8ed0d45aae.

* More fixes for fwd-mode AD on existential types

* Add anyValueSize inference pass

* Fix checking of `Differential.Differential==Differential`

* In-progress: infer any-value-size for existential types

* Existentials now work in forward-mode

* Overhaul handling of existential AD types. Fwd-mode works, reverse-mode requires front-end changes

* Reverse-mode now works on existentials

* Cleanup

* Remove diff rules for create existential object for now

* Revert treat-as-differentiable changes

* Fixes

* More fixes

* Cleanup

* more cleanup

* signed/unsigned

* Revert "Cleanup"

This reverts commit e4f7d71f07bb207736f90708961eeecd09a1b652.

* Cleanup (again)

* Remove public/export/keep-alive on null differential after AD pass

* Minor fix

* Update dictionary accessors

* Keep export decoration

* More fixes + Support for `kIROp_PackAnyValue`

* Merge upstream

* Update expected-failure.txt
---
 source/slang/slang-check-expr.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'source/slang/slang-check-expr.cpp')

diff --git a/source/slang/slang-check-expr.cpp b/source/slang/slang-check-expr.cpp
index 05cb6262b..3d2f81edb 100644
--- a/source/slang/slang-check-expr.cpp
+++ b/source/slang/slang-check-expr.cpp
@@ -500,6 +500,12 @@ namespace Slang
         // Don't synthesize for ThisType.
         if (as<ThisTypeDecl>(subType->getDeclRef().getDecl()))
             return nullptr;
+        
+        // If the inner most subtype is itself an associated type, then we're dealing
+        // with an abstract type. There's not need to synthesize anythin at this point.
+        // 
+        if (as<AssocTypeDecl>(subType->getDeclRef().getDecl()))
+            return nullptr;
 
         // If we reach here, we are expecting a synthesized decl defined in `subType`.
         // Instead of returning a DeclRefExpr to the requirement decl, we synthesize a placeholder decl
-- 
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