https://www.graalvm.org/ 
class com.oracle.truffle.tck.tests.TestContext$7$1 implements java.util.function.Function<java.lang.String, java.util.Collection<? extends S>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tck.tests.TestContext$7$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.tck.tests.TestContext$7 this$1;
    descriptor: Lcom/oracle/truffle/tck/tests/TestContext$7;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final java.util.function.Function val$provider;
    descriptor: Ljava/util/function/Function;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.util.Map$Entry val$e;
    descriptor: Ljava/util/Map$Entry;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.tck.tests.TestContext$7, java.util.function.Function, java.util.Map$Entry);
    descriptor: (Lcom/oracle/truffle/tck/tests/TestContext$7;Ljava/util/function/Function;Ljava/util/Map$Entry;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // com.oracle.truffle.tck.tests.TestContext$7$1 this
         0: .line 271
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.tck.tests.TestContext$7$1.this$1:Lcom/oracle/truffle/tck/tests/TestContext$7;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.tck.tests.TestContext$7$1.val$provider:Ljava/util/function/Function;
            aload 0 /* this */
            aload 3
            putfield com.oracle.truffle.tck.tests.TestContext$7$1.val$e:Ljava/util/Map$Entry;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tck.tests.TestContext$7$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tck/tests/TestContext$7$1;
    MethodParameters:
              Name  Flags
      this$0        final
      val$provider  final
      val$e         final

  public java.util.Collection<? extends S> apply(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/util/Collection;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tck.tests.TestContext$7$1 this
        start local 1 // java.lang.String k
         0: .line 274
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$7$1.val$provider:Ljava/util/function/Function;
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$7$1.val$e:Ljava/util/Map$Entry;
            invokeinterface java.util.Map$Entry.getValue:()Ljava/lang/Object;
            checkcast org.graalvm.polyglot.tck.LanguageProvider
            invokeinterface java.util.function.Function.apply:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.util.Collection
            areturn
        end local 1 // java.lang.String k
        end local 0 // com.oracle.truffle.tck.tests.TestContext$7$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tck/tests/TestContext$7$1;
            0    1     1     k  Ljava/lang/String;
    Signature: (Ljava/lang/String;)Ljava/util/Collection<+TS;>;
    MethodParameters:
      Name  Flags
      k     

  public java.lang.Object apply(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.String
            invokevirtual com.oracle.truffle.tck.tests.TestContext$7$1.apply:(Ljava/lang/String;)Ljava/util/Collection;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<Ljava/lang/String;Ljava/util/Collection<+TS;>;>;
SourceFile: "TestContext.java"
EnclosingMethod: com.oracle.truffle.tck.tests.TestContext$7.apply:(Ljava/util/Map$Entry;)Ljava/util/stream/Stream;
NestHost: com.oracle.truffle.tck.tests.TestContext
InnerClasses:
  com.oracle.truffle.tck.tests.TestContext$7
  com.oracle.truffle.tck.tests.TestContext$7$1
  public abstract Entry = java.util.Map$Entry of java.util.Map