Gardening: Fix more warnings

lib/AST/ASTPrinter.cpp

@@ -4521,7 +4521,7 @@ void PrintAST::visitSubscriptDecl(SubscriptDecl *decl) {
     Printer.callPrintStructurePre(PrintStructureKind::FunctionReturnType);
 
     if (!Options.SuppressSendingArgsAndResults) {
-      if (auto typeRepr = decl->getElementTypeRepr()) {
+      if (decl->getElementTypeRepr()) {
         if (isa<SendingTypeRepr>(decl->getResultTypeRepr()))
           Printer << "sending ";
       }

lib/AST/ProtocolConformanceRef.cpp

@@ -98,7 +98,7 @@ ProtocolConformanceRef::subst(Type origType, InFlightSubstitution &IFS) const {
 
   // If the type is an opaque archetype, the conformance will remain abstract,
   // unless we're specifically substituting opaque types.
-  if (auto origArchetype = origType->getAs<OpaqueTypeArchetypeType>()) {
+  if (origType->getAs<OpaqueTypeArchetypeType>()) {
     if (!IFS.shouldSubstituteOpaqueArchetypes()) {
       return forAbstract(origType.subst(IFS), proto);
     }

lib/Macros/Sources/SwiftMacros/DistributedResolvableMacro.swift

@@ -80,7 +80,7 @@ extension DistributedResolvableMacro {
     if var variable = requirement.decl.as(VariableDeclSyntax.self) {
       variable.modifiers = variable.modifiers.filter { !$0.isAccessControl }
       access.reversed().forEach { modifier in
-        variable.modifiers = variable.modifiers.prepending(modifier)
+        variable.modifiers = [modifier] + variable.modifiers
       }
 
       var accessorStubs: [String] = []
@@ -106,7 +106,7 @@ extension DistributedResolvableMacro {
     } else if var fun = requirement.decl.as(FunctionDeclSyntax.self) {
       fun.modifiers = fun.modifiers.filter { !$0.isAccessControl }
       access.reversed().forEach { modifier in
-        fun.modifiers = fun.modifiers.prepending(modifier)
+        fun.modifiers = [modifier] + fun.modifiers
       }
 
       // normal function stub

lib/Macros/Sources/SwiftMacros/SwiftifyImportMacro.swift

@@ -677,14 +677,14 @@ struct CountedOrSizedReturnPointerThunkBuilder: PointerBoundsThunkBuilder {
         if unsafe _resultValue == nil {
           return nil
         } else {
-          return unsafe \(raw: try cast)(\(raw: startLabel): _resultValue!, count: Int(\(countExpr)))
+          return unsafe \(raw: cast)(\(raw: startLabel): _resultValue!, count: Int(\(countExpr)))
         }
       }()
       """
     }
     return
       """
-      unsafe \(raw: try cast)(\(raw: startLabel): \(call), count: Int(\(countExpr)))
+      unsafe \(raw: cast)(\(raw: startLabel): \(call), count: Int(\(countExpr)))
       """
   }
 }

lib/SIL/IR/SILConstants.cpp

@@ -71,6 +71,7 @@ void SymbolicValue::print(llvm::raw_ostream &os, unsigned indent) const {
     SmallVector<char, 0> stringFloatRepr;
     getFloatValue().toString(stringFloatRepr);
     os << "float: " << stringFloatRepr << "\n";
+    return;
   }
   case RK_String:
     os << "string: \"" << getStringValue() << "\"\n";