https://www.graalvm.org/ 
final class com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext
  super_class: java.lang.Object
{
  private final com.oracle.truffle.api.TruffleLanguage$Env env;
    descriptor: Lcom/oracle/truffle/api/TruffleLanguage$Env;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 2140
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 2141
            aload 0 /* this */
            aload 1 /* env */
            putfield com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext.env:Lcom/oracle/truffle/api/TruffleLanguage$Env;
         2: .line 2142
            return
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/test/polyglot/FileSystemsTest$LanguageContext;
            0    3     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    MethodParameters:
      Name  Flags
      env   final

  com.oracle.truffle.api.TruffleLanguage$Env env();
    descriptor: ()Lcom/oracle/truffle/api/TruffleLanguage$Env;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext this
         0: .line 2145
            aload 0 /* this */
            getfield com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext.env:Lcom/oracle/truffle/api/TruffleLanguage$Env;
            areturn
        end local 0 // com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/test/polyglot/FileSystemsTest$LanguageContext;
}
SourceFile: "FileSystemsTest.java"
NestHost: com.oracle.truffle.api.test.polyglot.FileSystemsTest
InnerClasses:
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  private final LanguageContext = com.oracle.truffle.api.test.polyglot.FileSystemsTest$LanguageContext of com.oracle.truffle.api.test.polyglot.FileSystemsTest