test/jdk/java/foreign/StdLibTest.java

*** 356,12 ***
              }
          }
  
          int vprintf(String format, List<PrintfArg> args) throws Throwable {
              try (MemorySegment formatStr = toCString(format)) {
!                 return (int)vprintf.invokeExact(formatStr.baseAddress(),
!                         VaList.make(b -> args.forEach(a -> a.accept(b))));
              }
          }
  
          private MethodHandle specializedPrintf(List<PrintfArg> args) {
              //method type
--- 356,19 ---
              }
          }
  
          int vprintf(String format, List<PrintfArg> args) throws Throwable {
              try (MemorySegment formatStr = toCString(format)) {
!                 VaList vaList = VaList.make(b -> args.forEach(a -> a.accept(b)));
!                 int result = (int)vprintf.invokeExact(formatStr.baseAddress(), vaList);
+                 try {
+                     vaList.close();
+                 }
+                 catch (UnsupportedOperationException e) {
+                     assertEquals(e.getMessage(), "Empty VaList");
+                 }
+                 return result;
              }
          }
  
          private MethodHandle specializedPrintf(List<PrintfArg> args) {
              //method type