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-rw-r--r--source/slang/slang-ast-type.cpp6
1 files changed, 2 insertions, 4 deletions
diff --git a/source/slang/slang-ast-type.cpp b/source/slang/slang-ast-type.cpp
index 9b6b439ce..ee5d1d40e 100644
--- a/source/slang/slang-ast-type.cpp
+++ b/source/slang/slang-ast-type.cpp
@@ -772,10 +772,8 @@ DeclRef<InterfaceDecl> ExtractExistentialType::getSpecializedInterfaceDeclRef()
SubtypeWitness* openedWitness = getSubtypeWitness();
- ThisTypeSubstitution* openedThisType = m_astBuilder->create<ThisTypeSubstitution>();
- openedThisType->outer = originalInterfaceDeclRef.getSubst();
- openedThisType->interfaceDecl = interfaceDecl;
- openedThisType->witness = openedWitness;
+ ThisTypeSubstitution* openedThisType = m_astBuilder->getOrCreateThisTypeSubstitution(
+ interfaceDecl, openedWitness, originalInterfaceDeclRef.getSubst());
DeclRef<InterfaceDecl> specialiedInterfaceDeclRef = m_astBuilder->getSpecializedDeclRef<InterfaceDecl>(interfaceDecl, openedThisType);