code: //non-compiled with javac: Compilable with Java19
  package com.puppycrawl.tools.checkstyle.grammar.java19;
  
  public class InputJava19PatternsInNullSwitch1 {
  
      class Super {}
      class Sub extends Super {}
      record R(Super s) {}
  
      private int matchingSwitch14(R r) {
          return switch(r) {
              case R(Super s) -> 1;
              default -> 2;
          };
      }
  
      private int matchingSwitch15(R r) {
          return switch(r) {
              case R(Sub s) -> 1;
              default -> 2;
          };
      }
  
      private int matchingSwitch1(Object obj) {
          return switch (obj) {
              case String s -> s.length();
              case null, Integer i -> i == null ? -1 : 100 + i;
              default -> -2;
          };
      }
  
      private int matchingSwitch2(Object obj) {
          return switch (obj) {
              case String s -> 0;
              case null, default -> 1;
          };
      }
  
      private int matchingSwitch3(Object obj) {
          return switch (obj) {
              case String s -> s.length();
              case Integer i, null -> i == null ? -1 : 100 + i;
              default -> -2;
          };
      }
  
      private int matchingSwitch4(Object obj) {
          return switch (obj) {
              case String s -> 0;
              case default, null -> 1;
          };
      }
  
      private int matchingSwitch5(Object obj) {
          return switch (obj) {
              case String s: yield s.length();
              case null:
              case Integer i: yield i == null ? -1 : 100 + i;
              default: yield -2;
          };
      }
  
      private int matchingSwitch6(Object obj) {
          return switch (obj) {
              case String s: yield 0;
              case null:
              default: yield 1;
          };
      }
  
      private int matchingSwitch7(Object obj) {
          return switch (obj) {
              case String s: yield s.length();
              case Integer i:
              case null: yield i == null ? -1 : 100 + i;
              default: yield -2;
          };
      }
  
      private int matchingSwitch8(Object obj) {
          return switch (obj) {
              case String s: yield 0;
              default:
              case null: yield 1;
          };
      }
  
      private int matchingSwitch9a(Object obj) {
          return switch (obj) {
              case String s: yield 0;
              case null, Object o: yield 1;
          };
      }
  
      private int matchingSwitch10a(Object obj) {
          switch (obj) {
              case String s: return 0;
              case null, Object o: return 1;
          }
      }
  }
  