address review comment

Author: sophiapoirier

Sources/SwiftParserDiagnostics/ParseDiagnosticsGenerator.swift

@@ -630,7 +630,9 @@ public class ParseDiagnosticsGenerator: SyntaxAnyVisitor {
         message: { _ in .typeParameterPackEllipsis }
       )
     } else if let unexpected = node.unexpectedBetweenNameAndColon,
-              let unexpectedEllipsis = unexpected.onlyToken(where: { $0.tokenKind == .ellipsis }) {
+      let unexpectedEllipsis = unexpected.onlyToken(where: { $0.tokenKind == .ellipsis }),
+      let each = node.each
+    {
       addDiagnostic(
         unexpected,
         .typeParameterPackEllipsis,
@@ -639,11 +641,11 @@ public class ParseDiagnosticsGenerator: SyntaxAnyVisitor {
             message: ReplaceTokensFixIt(replaceTokens: [unexpectedEllipsis], replacement: .keyword(.each)),
             changes: [
               .makeMissing(unexpected),
-              .makePresent(node.each!, trailingTrivia: .space)
+              .makePresent(each, trailingTrivia: .space),
             ]
           )
         ],
-        handledNodes: [unexpected.id, node.each!.id]
+        handledNodes: [unexpected.id, each.id]
       )
     }
     if let inheritedTypeName = node.inheritedType?.as(SimpleTypeIdentifierSyntax.self)?.name {