https://www.graalvm.org/ 
class com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest extends com.oracle.truffle.api.dsl.test.TypeSystemTest$ValueNode
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest
  super_class: com.oracle.truffle.api.dsl.test.TypeSystemTest$ValueNode
{
  protected final com.oracle.truffle.api.Assumption field;
    descriptor: Lcom/oracle/truffle/api/Assumption;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest this
         0: .line 101
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.dsl.test.TypeSystemTest$ValueNode.<init>:()V
         1: .line 103
            aload 0 /* this */
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createAssumption:()Lcom/oracle/truffle/api/Assumption;
            putfield com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest.field:Lcom/oracle/truffle/api/Assumption;
         2: .line 101
            return
        end local 0 // com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/dsl/test/AssumptionsTest$FieldTest;

  static int do1(int);
    descriptor: (I)I
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int value
         0: .line 107
            iload 0 /* value */
            ireturn
        end local 0 // int value
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  value  I
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(assumptions = {"field"})
    MethodParameters:
       Name  Flags
      value  
}
SourceFile: "AssumptionsTest.java"
NestHost: com.oracle.truffle.api.dsl.test.AssumptionsTest
InnerClasses:
  FieldTest = com.oracle.truffle.api.dsl.test.AssumptionsTest$FieldTest of com.oracle.truffle.api.dsl.test.AssumptionsTest
  public ValueNode = com.oracle.truffle.api.dsl.test.TypeSystemTest$ValueNode of com.oracle.truffle.api.dsl.test.TypeSystemTest
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.NodeChild()