Allow Retrieving Nominal Types from PPTs

Author: CodaFi

include/swift/AST/Types.h

@@ -6528,7 +6528,8 @@ inline NominalTypeDecl *TypeBase::getAnyNominal() {
 inline Type TypeBase::getNominalParent() {
   if (auto existential = getAs<ExistentialType>())
     return existential->getConstraintType()->getNominalParent();
-
+  if (auto ppt = getAs<ParameterizedProtocolType>())
+    return ppt->getBaseType()->getNominalParent();
   return castTo<AnyGenericType>()->getParent();
 }
 

lib/AST/Type.cpp

@@ -106,6 +106,8 @@ NominalTypeDecl *CanType::getAnyNominal() const {
 GenericTypeDecl *CanType::getAnyGeneric() const {
   if (auto existential = dyn_cast<ExistentialType>(*this))
     return existential->getConstraintType()->getAnyGeneric();
+  if (auto ppt = dyn_cast<ParameterizedProtocolType>(*this))
+    return ppt->getBaseType()->getDecl();
   if (auto Ty = dyn_cast<AnyGenericType>(*this))
     return Ty->getDecl();
   return nullptr;