[Gardening] Fix some set but not used variables

lib/AST/ASTDemangler.cpp

@@ -155,7 +155,7 @@ Type ASTBuilder::createNominalType(GenericTypeDecl *decl, Type parent) {
     return Type();
 
   // If the declaration is generic, fail.
-  if (auto list = nominalDecl->getGenericParams())
+  if (nominalDecl->isGeneric())
     return Type();
 
   // Imported types can be renamed to be members of other (non-generic)

lib/AST/ASTDumper.cpp

@@ -5692,7 +5692,7 @@ namespace {
       } else if (auto *VD = originator.dyn_cast<VarDecl *>()) {
         printFieldQuotedRaw([&](raw_ostream &OS) { VD->dumpRef(OS); },
                             Label::optional("originating_var"), DeclColor);
-      } else if (auto *EE = originator.dyn_cast<ErrorExpr *>()) {
+      } else if (originator.is<ErrorExpr *>()) {
         printFlag("error_expr");
       } else if (auto *DMT = originator.dyn_cast<DependentMemberType *>()) {
         printRec(DMT, Label::always("dependent_member_type"));

lib/AST/ASTMangler.cpp

@@ -3050,7 +3050,7 @@ void ASTMangler::appendAnyGenericType(const GenericTypeDecl *decl,
       appendIdentifier(interface->getObjCRuntimeNameAsString());
     } else if (UseObjCRuntimeNames && protocol) {
       appendIdentifier(protocol->getObjCRuntimeNameAsString());
-    } else if (auto ctsd = dyn_cast<clang::ClassTemplateSpecializationDecl>(namedDecl)) {
+    } else if (isa<clang::ClassTemplateSpecializationDecl>(namedDecl)) {
       // If this is a `ClassTemplateSpecializationDecl`, it was
       // imported as a Swift decl with `__CxxTemplateInst...` name.
       // `ClassTemplateSpecializationDecl`'s name does not include information about
@@ -3247,7 +3247,7 @@ void ASTMangler::appendFunctionSignature(AnyFunctionType *fn,
       appendOperator("YK");
     }
   }
-  switch (auto diffKind = fn->getDifferentiabilityKind()) {
+  switch (fn->getDifferentiabilityKind()) {
   case DifferentiabilityKind::NonDifferentiable:
     break;
   case DifferentiabilityKind::Forward:
@@ -4158,11 +4158,11 @@ void ASTMangler::appendAccessorEntity(StringRef accessorKindCode,
 
   BaseEntitySignature base(decl);
   appendContextOf(decl, base);
-  if (auto *varDecl = dyn_cast<VarDecl>(decl)) {
+  if (isa<VarDecl>(decl)) {
     appendDeclName(decl);
     appendDeclType(decl, base);
     appendOperator("v", accessorKindCode);
-  } else if (auto *subscriptDecl = dyn_cast<SubscriptDecl>(decl)) {
+  } else if (isa<SubscriptDecl>(decl)) {
     appendDeclType(decl, base);
 
     StringRef privateDiscriminator = getPrivateDiscriminatorIfNecessary(decl);
@@ -4957,7 +4957,7 @@ getPrecheckedLocalContextDiscriminator(const Decl *decl, Identifier name) {
 std::string ASTMangler::mangleAttachedMacroExpansion(
     const Decl *decl, CustomAttr *attr, MacroRole role) {
   if (auto abiDecl = getABIDecl(decl)) {
-    return mangleAttachedMacroExpansion(decl, attr, role);
+    return mangleAttachedMacroExpansion(abiDecl, attr, role);
   }
 
   // FIXME(kavon): using the decl causes a cycle. Is a null base fine?

lib/AST/ASTNode.cpp

@@ -79,11 +79,11 @@ bool ASTNode::isImplicit() const {
     return D->isImplicit();
   if (const auto *P = this->dyn_cast<Pattern*>())
     return P->isImplicit();
-  if (const auto *T = this->dyn_cast<TypeRepr*>())
+  if (this->is<TypeRepr *>())
     return false;
-  if (const auto *C = this->dyn_cast<StmtConditionElement *>())
+  if (this->is<StmtConditionElement *>())
     return false;
-  if (const auto *I = this->dyn_cast<CaseLabelItem *>())
+  if (this->is<CaseLabelItem *>())
     return false;
   llvm_unreachable("unsupported AST node");
 }
@@ -124,9 +124,9 @@ void ASTNode::dump(raw_ostream &OS, unsigned Indent) const {
     P->dump(OS, Indent);
   else if (auto T = dyn_cast<TypeRepr*>())
     T->print(OS);
-  else if (auto *C = dyn_cast<StmtConditionElement *>())
+  else if (is<StmtConditionElement *>())
     OS.indent(Indent) << "(statement condition)";
-  else if (auto *I = dyn_cast<CaseLabelItem *>()) {
+  else if (is<CaseLabelItem *>()) {
     OS.indent(Indent) << "(case label item)";
   } else
     llvm_unreachable("unsupported AST node");

lib/AST/ASTPrinter.cpp

@@ -151,7 +151,7 @@ static bool isPrespecilizationDeclWithTarget(const ValueDecl *vd) {
   for (auto *attr : vd->getAttrs().getAttributes<SpecializeAttr>()) {
     if (!attr->isExported())
       continue;
-    if (auto *targetFun = attr->getTargetFunctionDecl(vd))
+    if (attr->getTargetFunctionDecl(vd))
       return true;
   }
   return false;
@@ -4132,7 +4132,7 @@ void PrintAST::visitAccessorDecl(AccessorDecl *decl) {
   // Explicitly print 'mutating' and 'nonmutating' if needed.
   printSelfAccessKindModifiersIfNeeded(decl);
 
-  switch (auto kind = decl->getAccessorKind()) {
+  switch (decl->getAccessorKind()) {
   case AccessorKind::Get:
   case AccessorKind::DistributedGet:
   case AccessorKind::Address:
@@ -4769,13 +4769,13 @@ void PrintAST::visitErrorExpr(ErrorExpr *expr) {
 
 void PrintAST::visitTernaryExpr(TernaryExpr *expr) {
   if (auto condExpr = expr->getCondExpr()) {
-    visit(expr->getCondExpr());
+    visit(condExpr);
   }
   Printer << " ? ";
   visit(expr->getThenExpr());
   Printer << " : ";
   if (auto elseExpr = expr->getElseExpr()) {
-    visit(expr->getElseExpr());
+    visit(elseExpr);
   }
 }
 
@@ -6056,7 +6056,7 @@ class TypePrinter : public TypeVisitor<TypePrinter> {
       } else if (auto *VD = originator.dyn_cast<VarDecl *>()) {
         Printer << "decl = ";
         Printer << VD->getName();
-      } else if (auto *EE = originator.dyn_cast<ErrorExpr *>()) {
+      } else if (originator.is<ErrorExpr *>()) {
         Printer << "error_expr";
       } else if (auto *DMT = originator.dyn_cast<DependentMemberType *>()) {
         visit(DMT);

lib/AST/ASTVerifier.cpp

@@ -1102,7 +1102,7 @@ class Verifier : public ASTWalker {
         resultType = FD->mapTypeIntoContext(resultType);
       } else if (auto closure = dyn_cast<AbstractClosureExpr>(func)) {
         resultType = closure->getResultType();
-      } else if (auto *CD = dyn_cast<ConstructorDecl>(func)) {
+      } else if (isa<ConstructorDecl>(func)) {
         resultType = TupleType::getEmpty(Ctx);
       } else {
         resultType = TupleType::getEmpty(Ctx);

lib/AST/ASTWalker.cpp

@@ -1281,7 +1281,7 @@ class Traversal : public ASTVisitor<Traversal, Expr*, Stmt*,
 
     for (auto &origComponent : components) {
       auto component = origComponent;
-      switch (auto kind = component.getKind()) {
+      switch (component.getKind()) {
       case KeyPathExpr::Component::Kind::Subscript:
       case KeyPathExpr::Component::Kind::UnresolvedSubscript: {
         if (auto *newArgs = doIt(component.getSubscriptArgs())) {

lib/AST/Attr.cpp

@@ -267,7 +267,7 @@ void OpenedTypeAttr::printImpl(ASTPrinter &printer,
   printer << "(\"" << getUUID() << "\"";
   if (auto constraintType = getConstraintType()) {
     printer << ", ";
-    getConstraintType()->print(printer, options);
+    constraintType->print(printer, options);
   }
   printer << ")";
   printer.printStructurePost(PrintStructureKind::BuiltinAttribute);

lib/AST/Decl.cpp

@@ -1691,7 +1691,7 @@ AccessLevel ImportDecl::getAccessLevel() const {
 }
 
 bool ImportDecl::isAccessLevelImplicit() const {
-  if (auto attr = getAttrs().getAttribute<AccessControlAttr>()) {
+  if (getAttrs().hasAttribute<AccessControlAttr>()) {
     return false;
   }
   return true;
@@ -4678,7 +4678,7 @@ static AccessLevel getAdjustedFormalAccess(const ValueDecl *VD,
   if (useDC) {
     // If the use site decl context is PackageUnit, just return
     // the access level that's passed in
-    if (auto usePkg = useDC->getPackageContext())
+    if (useDC->getPackageContext())
       return access;
     // Check whether we need to modify the access level based on
     // @testable/@_private import attributes.
@@ -8013,7 +8013,7 @@ bool VarDecl::isMemberwiseInitialized(bool preferDeclaredProperties) const {
   // memberwise initializable when it could be used to initialize
   // other stored properties.
   if (hasInitAccessor()) {
-    if (auto *init = getAccessor(AccessorKind::Init))
+    if (getAccessor(AccessorKind::Init))
       return true;
   }
 
@@ -11509,7 +11509,7 @@ ActorIsolation swift::getActorIsolationOfContext(
     return getClosureActorIsolation(closure);
   }
 
-  if (auto *tld = dyn_cast<TopLevelCodeDecl>(dcToUse)) {
+  if (isa<TopLevelCodeDecl>(dcToUse)) {
     if (dcToUse->isAsyncContext() ||
         dcToUse->getASTContext().LangOpts.StrictConcurrencyLevel >=
             StrictConcurrency::Complete) {

lib/AST/DistributedDecl.cpp

@@ -169,7 +169,7 @@ Type swift::getConcreteReplacementForProtocolActorSystemType(
   }
 
   /// === Maybe the value is declared in a protocol?
-  if (auto protocol = DC->getSelfProtocolDecl()) {
+  if (DC->getSelfProtocolDecl()) {
     GenericSignature signature;
     if (auto *genericContext = anyValue->getAsGenericContext()) {
       signature = genericContext->getGenericSignature();

lib/AST/Module.cpp

@@ -1978,7 +1978,7 @@ StringRef ModuleDecl::getModuleFilename() const {
       continue;
     }
     // Skip synthesized files.
-    if (auto *SFU = dyn_cast<SynthesizedFileUnit>(F))
+    if (isa<SynthesizedFileUnit>(F))
       continue;
     return StringRef();
   }

lib/AST/NameLookup.cpp

@@ -1774,7 +1774,7 @@ namelookup::isInMacroArgument(SourceFile *sourceFile, SourceLoc loc) {
 
         if (macro.getFreestanding()) {
           inMacroArgument = true;
-        } else if (auto *attr = macro.getAttr()) {
+        } else if (macro.getAttr()) {
           auto *moduleScope = sourceFile->getModuleScopeContext();
           auto results =
               lookupMacros(moduleScope, macro.getModuleName(),
@@ -1914,7 +1914,7 @@ PotentialMacroExpansions PotentialMacroExpansionsInContextRequest::evaluate(
           dc->getModuleScopeContext(), med->getMacroName(),
           MacroRole::Declaration, nameTracker);
     } else if (auto *vd = dyn_cast<ValueDecl>(member)) {
-      nameTracker.attachedTo = dyn_cast<ValueDecl>(member);
+      nameTracker.attachedTo = vd;
       forEachPotentialAttachedMacro(member, MacroRole::Peer, nameTracker);
     }
   }
@@ -2000,7 +2000,7 @@ populateLookupTableEntryFromMacroExpansions(ASTContext &ctx,
             dc->getModuleScopeContext(), med->getMacroName(),
             MacroRole::Declaration, nameTracker);
       } else if (auto *vd = dyn_cast<ValueDecl>(member)) {
-        nameTracker.attachedTo = dyn_cast<ValueDecl>(member);
+        nameTracker.attachedTo = vd;
         forEachPotentialAttachedMacro(member, MacroRole::Peer, nameTracker);
       }
 
@@ -3606,7 +3606,7 @@ CollectedOpaqueReprs swift::collectOpaqueTypeReprs(TypeRepr *r, ASTContext &ctx,
       if (!Ctx.LangOpts.hasFeature(Feature::ImplicitSome))
         return Action::Continue();
 
-      if (auto existential = dyn_cast<ExistentialTypeRepr>(repr)) {
+      if (isa<ExistentialTypeRepr>(repr)) {
         return Action::SkipNode();
       } else if (auto composition = dyn_cast<CompositionTypeRepr>(repr)) {
         if (!composition->isTypeReprAny())

lib/AST/SubstitutionMap.cpp

@@ -406,7 +406,7 @@ SubstitutionMap::getOverrideSubstitutions(
                                       const ValueDecl *baseDecl,
                                       const ValueDecl *derivedDecl) {
   // For overrides within a protocol hierarchy, substitute the Self type.
-  if (auto baseProto = baseDecl->getDeclContext()->getSelfProtocolDecl()) {
+  if (baseDecl->getDeclContext()->getSelfProtocolDecl()) {
     auto baseSig = baseDecl->getInnermostDeclContext()
         ->getGenericSignatureOfContext();
     return baseSig->getIdentitySubstitutionMap();

lib/AST/TypeSubstitution.cpp

@@ -105,7 +105,7 @@ operator()(CanType dependentType, Type conformingReplacementType,
            ProtocolDecl *conformedProtocol) const {
   // Lookup conformances for archetypes that conform concretely
   // via a superclass.
-  if (auto archetypeType = conformingReplacementType->getAs<ArchetypeType>()) {
+  if (conformingReplacementType->is<ArchetypeType>()) {
     return lookupConformance(
         conformingReplacementType, conformedProtocol,
         /*allowMissing=*/true);
@@ -667,7 +667,7 @@ SubstitutionMap TypeBase::getContextSubstitutionMap() {
     }
 
     // This case indicates we have invalid nesting of types.
-    if (auto protocolTy = baseTy->getAs<ProtocolType>()) {
+    if (baseTy->is<ProtocolType>()) {
       if (!first)
         break;
 

lib/ClangImporter/ClangImporter.cpp

@@ -5792,7 +5792,7 @@ synthesizeBaseClassFieldGetterOrAddressGetterBody(AbstractFunctionDecl *afd,
   baseMemberDotCallExpr->setThrows(nullptr);
 
   ArgumentList *argumentList;
-  if (auto subscript = dyn_cast<SubscriptDecl>(baseClassVar)) {
+  if (isa<SubscriptDecl>(baseClassVar)) {
     auto paramDecl = getterDecl->getParameters()->get(0);
     auto paramRefExpr = new (ctx) DeclRefExpr(paramDecl, DeclNameLoc(),
                                               /*Implicit=*/true);

lib/ClangImporter/ImportDecl.cpp

@@ -484,8 +484,7 @@ void ClangImporter::Implementation::addSynthesizedProtocolAttrs(
     // ctx.getProtocol(kind) != nulltpr which would be nice.
     if (auto proto = ctx.getProtocol(kind))
       nominal->getAttrs().add(
-          new (ctx) SynthesizedProtocolAttr(ctx.getProtocol(kind), this,
-                                            isUnchecked));
+          new (ctx) SynthesizedProtocolAttr(proto, this, isUnchecked));
   }
 }
 
@@ -4183,8 +4182,7 @@ namespace {
 
       if (decl->isVirtual()) {
         if (auto funcDecl = dyn_cast_or_null<FuncDecl>(method)) {
-          if (auto structDecl =
-                  dyn_cast_or_null<StructDecl>(method->getDeclContext())) {
+          if (isa_and_nonnull<StructDecl>(method->getDeclContext())) {
             // If this is a method of a Swift struct, any possible override of
             // this method would get sliced away, and an invocation would get
             // dispatched statically. This is fine because it matches the C++
@@ -4196,8 +4194,7 @@ namespace {
                                    "virtual function is not available in Swift "
                                    "because it is pure");
             }
-          } else if (auto classDecl = dyn_cast_or_null<ClassDecl>(
-                         funcDecl->getDeclContext())) {
+          } else if (isa_and_nonnull<ClassDecl>(funcDecl->getDeclContext())) {
             // This is a foreign reference type. Since `class T` on the Swift
             // side is mapped from `T*` on the C++ side, an invocation of a
             // virtual method `t->method()` should get dispatched dynamically.

lib/Driver/ToolChains.cpp

@@ -204,8 +204,7 @@ void ToolChain::addCommonFrontendArgs(const OutputInfo &OI,
     arguments.push_back("-disable-objc-interop");
   }
 
-  if (const Arg *arg = inputArgs.getLastArg(
-        options::OPT_experimental_serialize_debug_info)) {
+  if (inputArgs.getLastArg(options::OPT_experimental_serialize_debug_info)) {
     arguments.push_back(
         inputArgs.MakeArgString(Twine("-experimental-serialize-debug-info")));
   }

lib/DriverTool/autolink_extract_main.cpp

@@ -188,7 +188,7 @@ static bool extractLinkerFlags(const llvm::object::Binary *Bin,
       }
     }
     return bool(Error);
-  } else if (auto *IRObjectFile = llvm::dyn_cast<llvm::object::IRObjectFile>(Bin)) {
+  } else if (llvm::isa<llvm::object::IRObjectFile>(Bin)) {
     // Ignore the LLVM IR files (LTO)
     return false;
   }  else {

lib/Frontend/CompilerInvocation.cpp

@@ -3259,7 +3259,7 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
   if (auto A = Args.getLastArg(OPT_enable_round_trip_debug_types,
                                OPT_disable_round_trip_debug_types)) {
     Opts.DisableRoundTripDebugTypes =
-        Args.hasArg(OPT_disable_round_trip_debug_types);
+        A->getOption().matches(OPT_disable_round_trip_debug_types);
   }
 
   if (Args.hasArg(OPT_disable_debugger_shadow_copies))

lib/IDE/CompletionLookup.cpp

@@ -771,7 +771,7 @@ Type CompletionLookup::getAssociatedTypeType(const AssociatedTypeDecl *ATD) {
         CurrDeclContext->getInnermostTypeContext()->getDeclaredTypeInContext();
   if (BaseTy) {
     BaseTy = BaseTy->getInOutObjectType()->getMetatypeInstanceType();
-    if (auto NTD = BaseTy->getAnyNominal()) {
+    if (BaseTy->getAnyNominal()) {
       auto Conformance = lookupConformance(BaseTy, ATD->getProtocol());
       if (Conformance.isConcrete()) {
         return Conformance.getConcrete()->getTypeWitness(

lib/IDE/Formatting.cpp

@@ -524,7 +524,7 @@ class RangeWalker: protected ASTWalker {
       SourceRange Braces(PGD->getLBraceLoc(), PGD->getRBraceLoc());
       if (!handleBraces(Braces, ContextLoc))
         return Action::Stop();
-    } else if (auto *PDD = dyn_cast<PoundDiagnosticDecl>(D)) {
+    } else if (isa<PoundDiagnosticDecl>(D)) {
       // TODO: add paren locations to PoundDiagnosticDecl
     }
 
@@ -580,7 +580,7 @@ class RangeWalker: protected ASTWalker {
     } else if (auto *WS = dyn_cast<WhileStmt>(S)) {
       if (!handleBraceStmt(WS->getBody(), WS->getWhileLoc()))
         return Action::Stop();
-    } else if (auto *PAS = dyn_cast<PoundAssertStmt>(S)) {
+    } else if (isa<PoundAssertStmt>(S)) {
       // TODO: add paren locations to PoundAssertStmt
     }
 

lib/IDE/SourceEntityWalker.cpp

@@ -967,7 +967,7 @@ bool SemaAnnotator::shouldIgnore(Decl *D) {
   // Walk into missing decls to visit their attributes if they were generated
   // by a member attribute expansion. Note that we would have already skipped
   // this decl if we were ignoring expansions, so no need to check that.
-  if (auto *missing = dyn_cast<MissingDecl>(D)) {
+  if (isa<MissingDecl>(D)) {
     if (D->isInMacroExpansionInContext())
       return false;
   }

lib/IRGen/GenArchetype.cpp

@@ -405,7 +405,7 @@ const TypeInfo *TypeConverter::convertArchetypeType(ArchetypeType *archetype) {
   // Opaque result types can be private and from a different module. In this
   // case we can't access their type metadata from another module.
   IsABIAccessible_t abiAccessible = IsABIAccessible;
-  if (auto opaqueArchetype = dyn_cast<OpaqueTypeArchetypeType>(archetype)) {
+  if (isa<OpaqueTypeArchetypeType>(archetype)) {
     auto &currentSILModule = IGM.getSILModule();
     abiAccessible =
         currentSILModule.isTypeMetadataAccessible(archetype->getCanonicalType())

lib/IRGen/GenCall.cpp

@@ -6620,7 +6620,7 @@ llvm::FunctionType *FunctionPointer::getFunctionType() const {
   }
 
   // Read the function type off the global or else from the Signature.
-  if (auto *constant = dyn_cast<llvm::Constant>(Value)) {
+  if (isa<llvm::Constant>(Value)) {
     auto *gv = dyn_cast<llvm::GlobalValue>(Value);
     if (!gv) {
       return Sig.getType();