================================================================================
Identifiers
================================================================================

  def m = ???
  def unary_! = true
  def a_-> = ???
  def __symtem = ???
  def empty_? = ???
  def ひらがな = ???
  def a_^ = ???

--------------------------------------------------------------------------------

(compilation_unit
  (function_definition
    (identifier)
    (operator_identifier))
  (function_definition
    (identifier)
    (boolean_literal))
  (function_definition
    (identifier)
    (operator_identifier))
  (function_definition
    (identifier)
    (operator_identifier))
  (function_definition
    (identifier)
    (operator_identifier))
  (function_definition
    (identifier)
    (operator_identifier))
  (function_definition
    (identifier)
    (operator_identifier)))

================================================================================
$ in identifier names
================================================================================

class $A$B$ {
  val b$, c$ : Int
  val d$ : String
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (val_declaration
        (identifier)
        (identifier)
        (type_identifier))
      (val_declaration
        (identifier)
        (type_identifier)))))

================================================================================
Operator identifiers
================================================================================

type ::[+Ab] = scala.collection.immutable.::[Ab]
val :: = scala.collection.immutable.::

val +: = scala.collection.+:
val :+ = scala.collection.:+

def → = ???

val test = id.##

val x = y
/////////
// avoid matching slashes as operator
/////////

--------------------------------------------------------------------------------

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    (type_identifier)
    (type_parameters
      (covariant_type_parameter
        (identifier)))
    (generic_type
      (stable_type_identifier
        (stable_identifier
          (stable_identifier
            (identifier)
            (identifier))
          (identifier))
        (type_identifier))
      (type_arguments
        (type_identifier))))
  (val_definition
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          (identifier)
          (identifier))
        (identifier))
      (operator_identifier)))
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        (identifier))
      (operator_identifier)))
  (val_definition
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        (identifier))
      (operator_identifier)))
  (function_definition
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    (operator_identifier))
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    (field_expression
      (identifier)
      (operator_identifier)))
  (val_definition
    (identifier)
    (identifier))
  (comment)
  (comment)
  (comment))

================================================================================
Package
================================================================================

package a.b
package c {
  object A
}

--------------------------------------------------------------------------------

(compilation_unit
  (package_clause
    (package_identifier
      (identifier)
      (identifier)))
  (package_clause
    (package_identifier
      (identifier))
    (template_body
      (object_definition
        (identifier)))))

================================================================================
Package with comma
================================================================================

package a.b;

--------------------------------------------------------------------------------

(compilation_unit
  (package_clause
    (package_identifier
      (identifier)
      (identifier))))

================================================================================
Package (Scala 3 syntax)
================================================================================

package a.b
package c:
  object A

package d:
  object A
end d

--------------------------------------------------------------------------------

(compilation_unit
  (package_clause
    (package_identifier
      (identifier)
      (identifier)))
  (package_clause
    (package_identifier
      (identifier))
    (template_body
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        (identifier))))
  (package_clause
    (package_identifier
      (identifier))
    (template_body
      (object_definition
        (identifier)))))

================================================================================
Package object
================================================================================

package object d extends A {
  val hello: String = "there"
}

--------------------------------------------------------------------------------

(compilation_unit
  (package_object
    (identifier)
    (extends_clause
      (type_identifier))
    (template_body
      (val_definition
        (identifier)
        (type_identifier)
        (string)))))

================================================================================
Imports
================================================================================

import PartialFunction.condOpt
import a.b, c.e
import reflect.io.{Directory, File, Path}
import a.{
  b,
}
import Opts.+
import a.{ :: }

--------------------------------------------------------------------------------

(compilation_unit
  (import_declaration
    (identifier)
    (identifier))
  (import_declaration
    (identifier)
    (identifier)
    (identifier)
    (identifier))
  (import_declaration
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      (identifier)))
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  (import_declaration
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      (operator_identifier))
  (import_declaration
      (identifier)
      (namespace_selectors
        (operator_identifier))))

================================================================================
Imports: Wildcard
================================================================================

import tools.nsc.classpath._

--------------------------------------------------------------------------------

(compilation_unit
  (import_declaration
    (identifier)
    (identifier)
    (identifier)
    (namespace_wildcard)))

================================================================================
Imports: Wildcard (Scala 3 syntax)
================================================================================

import tools.nsc.classpath.*
import a.b.*, b.c, c.*

--------------------------------------------------------------------------------

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  (import_declaration
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    (identifier)
    (identifier)
    (namespace_wildcard))
  (import_declaration
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    (identifier)
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    (identifier)
    (identifier)
    (identifier)
    (namespace_wildcard)))

================================================================================
Imports: Wildcard and wildcard givens (Scala 3 syntax)
================================================================================

import tools.nsc.classpath.{*, given}
import tools.given

--------------------------------------------------------------------------------

(compilation_unit
  (import_declaration
    (identifier)
    (identifier)
    (identifier)
    (namespace_selectors
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      (namespace_wildcard)))
  (import_declaration
    (identifier)
    (namespace_wildcard)))

================================================================================
Imports: Givens by type (Scala 3 syntax)
================================================================================

import tools.nsc.classpath.{given Test, given Test2, Test3}

--------------------------------------------------------------------------------

(compilation_unit
  (import_declaration
    (identifier)
    (identifier)
    (identifier)
    (namespace_selectors
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      (type_identifier)
      (identifier))))

================================================================================
Imports: Rename (Scala 3 Syntax)
================================================================================

import lang.System.{lineSeparator as EOL}
import lang.System.lineSeparator as EOL
import lang.System.lineSeparator as _

--------------------------------------------------------------------------------

(compilation_unit
  (import_declaration
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        (identifier))))
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    (identifier)
    (as_renamed_identifier
      (identifier)
      (identifier)))
  (import_declaration
    (identifier)
    (identifier)
    (as_renamed_identifier
      (identifier)
      (wildcard))))

================================================================================
Imports: Rename
================================================================================

import lang.System.{lineSeparator => EOL}
import lang.System.{lineSeparator => _}

--------------------------------------------------------------------------------

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  (import_declaration
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        (identifier)
        (identifier))))
  (import_declaration
    (identifier)
    (identifier)
    (namespace_selectors
      (arrow_renamed_identifier
        (identifier)
        (wildcard)))))

================================================================================
Object definitions
================================================================================

// o1
object O1 {
}

case object O2 {
}

object O3 extends A {
}

--------------------------------------------------------------------------------

(compilation_unit
  (comment)
  (object_definition
    (identifier)
    (template_body))
  (object_definition
    (identifier)
    (template_body))
  (object_definition
    (identifier)
    (extends_clause
      (type_identifier))
    (template_body)))

================================================================================
Object definitions
================================================================================
case object A extends B derives C, D {}
--------------------------------------------------------------------------------

(compilation_unit
  (object_definition
    (identifier)
    (extends_clause
      (type_identifier))
    (derives_clause
      (type_identifier)
      (type_identifier))
    (template_body)))

================================================================================
Class definitions
================================================================================

class C[
  T,
  U,
] {
}
--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (type_parameters
      (identifier)
      (identifier))
    (template_body)))

================================================================================
Class definitions (Scala 3)
================================================================================
final case class C() extends A derives B, C
--------------------------------------------------------------------------------

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      (type_identifier))))

================================================================================
Subclass definitions
================================================================================

class A extends B.C[D, E] {
}

class A(b: B) extends C(b || ok) {
}

object C {
    class A
        extends B[T]
        with C[T]
}

class D(c: String) extends E(c) with F

class MyClass extends Potato() with Tomato

--------------------------------------------------------------------------------

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      (arguments
        (identifier))
      (type_identifier)))
  (class_definition
    (identifier)
    (extends_clause
      (type_identifier)
      (arguments)
      (type_identifier))))

================================================================================
Subclass definitions (Scala 3 syntax)
================================================================================

class A extends B, C:
 1
end A

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (extends_clause
      (type_identifier)
      (type_identifier))
    (template_body
      (integer_literal))))

================================================================================
Class definitions with parameters
================================================================================

class Point(
  val x: Int,
  val y: Int,
)(implicit coord: Coord)

// TODO: The last argument should become class_parameters
class A @Inject()(x: Int, y: Int)

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (class_parameters
      (class_parameter
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      (class_parameter
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        (identifier)
        (type_identifier))))
  (comment)
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      (type_identifier)
      (arguments)
      (arguments
        (ascription_expression
          (identifier)
          (type_identifier))
        (ascription_expression
          (identifier)
          (type_identifier))))))

================================================================================
Class definitions with parameters (Scala 3 syntax)
================================================================================

class Point(val x: Int, val y: Int)(using coord: Coord)

// TODO: The last argument should become class_parameters
class A @ann (x: Int, y: Int)

// TODO: The last argument should become class_parameters
class A @ann(1) (x: Int, y: Int)

// TODO: The last argument should become class_parameters
class A @ann(1)(1) (x: Int, y: Int)

--------------------------------------------------------------------------------

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  (class_definition
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      (class_parameter
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  (comment)
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    (identifier)
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      (type_identifier)
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          (type_identifier)))))
  (comment)
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      (arguments
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        (ascription_expression
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          (type_identifier)))))
  (comment)
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      (arguments
        (integer_literal))
      (arguments
        (ascription_expression
          (identifier)
          (type_identifier))
        (ascription_expression
          (identifier)
          (type_identifier))))))

================================================================================
Modifiers
================================================================================

implicit final sealed class Point {
  private override def getX() = 1
}

private[a] class D[T] private (x: T) {
  private[a] def b: Byte
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (modifiers)
    (identifier)
    (template_body
      (function_definition
        (modifiers
          (access_modifier))
        (identifier)
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  (class_definition
    (modifiers
      (access_modifier
        (access_qualifier
          (identifier))))
    (identifier)
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    (access_modifier)
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        (type_identifier)))
    (template_body
      (function_declaration
        (modifiers
          (access_modifier
            (access_qualifier
              (identifier))))
        (identifier)
        (type_identifier)))))

================================================================================
Trait definitions
================================================================================

trait A extends B

trait A extends B with C

trait T[U] {
}

trait T[U] extends V.W[U] {
}

--------------------------------------------------------------------------------

(compilation_unit
  (trait_definition
    (identifier)
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  (trait_definition
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      (type_identifier)))
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    (template_body))
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      (identifier))
    (extends_clause
      (generic_type
        (stable_type_identifier
          (identifier)
          (type_identifier))
        (type_arguments
          (type_identifier))))
    (template_body)))

================================================================================
Value declarations
================================================================================

class A {
  val b, c : Int
  val d : String
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (val_declaration
        (identifier)
        (identifier)
        (type_identifier))
      (val_declaration
        (identifier)
        (type_identifier)))))

================================================================================
Value declarations (Scala 3 syntax)
================================================================================

class A:
  val b, c : Int
  val d : String

--------------------------------------------------------------------------------

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  (class_definition
    (identifier)
    (template_body
      (val_declaration
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        (identifier)
        (type_identifier))
      (val_declaration
        (identifier)
        (type_identifier)))))

================================================================================
Value definitions
================================================================================

class A {
  val b = 1
  val c : String = "d"
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (val_definition
        (identifier)
        (integer_literal))
      (val_definition
        (identifier)
        (type_identifier)
        (string)))))

================================================================================
Variable declarations
================================================================================

class A {
  var b, c : Int
  var d : String
}

--------------------------------------------------------------------------------

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  (class_definition
    (identifier)
    (template_body
      (var_declaration
        (identifier)
        (identifier)
        (type_identifier))
      (var_declaration
        (identifier)
        (type_identifier)))))

================================================================================
Variable definitions
================================================================================

class A {
  var b : Int = 1
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (var_definition
        (identifier)
        (type_identifier)
        (integer_literal)))))

================================================================================
Variable definitions (Scala 3 syntax)
================================================================================

class A:
  var b: Int = 1
  var c: Int =
    val d = 2
    d

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (var_definition
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      (var_definition
        (identifier)
        (type_identifier)
        (indented_block
          (val_definition
            (identifier)
            (integer_literal))
          (identifier))))))

================================================================================
Type definitions
================================================================================

class A {
  type B = C
  type D[E] = F
  type Abs
  type Beta[B]
}

--------------------------------------------------------------------------------

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  (class_definition
    (identifier)
    (template_body
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        (type_identifier))
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          (identifier))
        (type_identifier))
      (type_definition
        (type_identifier))
      (type_definition
        (type_identifier)
        (type_parameters
          (identifier))))))

================================================================================
Function declarations
================================================================================

class A {
  def b(c: D) : E
  def <*[B](that: IO[B]): IO[A]
}

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
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        (parameters
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      (function_declaration
        (operator_identifier)
        (type_parameters
          (identifier))
        (parameters
          (parameter
            (identifier)
            (generic_type
              (type_identifier)
              (type_arguments
                (type_identifier)))))
        (generic_type
          (type_identifier)
          (type_arguments
            (type_identifier)))))))

================================================================================
Function definitions
================================================================================

class A {
  def b(
    c: D,
    e: F,
  ) = 1

  def h(x: T)(implicit ev: Reads[T])

  def l: Int =
    1

  def m = ()

  def n(using a: A)(using B <:< B, C =:= C) = ()
}

--------------------------------------------------------------------------------

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  (class_definition
    (identifier)
    (template_body
      (function_definition
        (identifier)
        (parameters
          (parameter
            (identifier)
            (type_identifier))
          (parameter
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            (type_identifier)))
        (integer_literal))
      (function_declaration
        (identifier)
        (parameters
          (parameter
            (identifier)
            (type_identifier)))
        (parameters
          (parameter
            (identifier)
            (generic_type
              (type_identifier)
              (type_arguments
                (type_identifier))))))
      (function_definition
        (identifier)
        (type_identifier)
        (indented_block
          (integer_literal)))
      (function_definition
        (identifier)
        (unit))
      (function_definition
        (identifier)
        (parameters
          (parameter
            (identifier)
            (type_identifier)))
        (parameters
          (infix_type
            (type_identifier)
            (operator_identifier)
            (type_identifier))
          (infix_type
            (type_identifier)
            (operator_identifier)
            (type_identifier)))
        (unit)))))

================================================================================
Function definitions (Scala 3 syntax)
================================================================================

class A:
  def foo(c: C): Int =
    val x = 1
    val y = 2
    x + y

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (function_definition
        (identifier)
        (parameters
          (parameter
            (identifier)
            (type_identifier)))
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            (identifier)
            (integer_literal))
          (val_definition
            (identifier)
            (integer_literal))
          (infix_expression
            (identifier)
            (operator_identifier)
            (identifier)))))))

================================================================================
Extension methods (Scala 3 syntax)
================================================================================

object A:
  extension (c: C)
    def foo: Int = 1
  
  extension [A1](d: D) def foo = "foo"

--------------------------------------------------------------------------------

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  (object_definition
    (identifier)
    (template_body
      (extension_definition
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          (parameter
            (identifier)
            (type_identifier)))
        (function_definition
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          (integer_literal)))
      (extension_definition
        (type_parameters
          (identifier))
        (parameters
          (parameter
            (identifier)
            (type_identifier)))
        (function_definition
          (identifier)
          (string))))))

================================================================================
Given instance definitions (Scala 3 syntax)
================================================================================

object A:
  given a: A = x

  given intFoo: CanFoo[Int] with
    def foo(x: Int): Int = 0

  given CanFoo[Int] with
    def foo(x: Int): Int = 0

  private given listFoo[A1](using ev: CanFoo[A1]): CanFoo[List[A1]] with
    def foo(xs: List[A1]): Int = 0

  given [T: Ordering]: Ordering[List[T]] with
    def x = ()

  given Context = ctx

  given Context[T] = ctx


--------------------------------------------------------------------------------

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        (identifier))
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          (type_arguments
            (type_identifier)))
        (with_template_body
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            (parameters
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                (identifier)
                (type_identifier)))
            (type_identifier)
            (integer_literal))))
      (given_definition
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          (type_identifier)
          (type_arguments
            (type_identifier)))
        (with_template_body
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                (identifier)
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            (type_identifier)
            (integer_literal))))
      (given_definition
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        (identifier)
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            (identifier)
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              (type_arguments
                (type_identifier)))))
        (generic_type
          (type_identifier)
          (type_arguments
            (generic_type
              (type_identifier)
              (type_arguments
                (type_identifier)))))
        (with_template_body
          (function_definition
            (identifier)
            (parameters
              (parameter
                (identifier)
                (generic_type
                  (type_identifier)
                  (type_arguments
                    (type_identifier)))))
            (type_identifier)
            (integer_literal))))
      (given_definition
        (identifier
          (MISSING _alpha_identifier))
        (type_parameters
          (identifier)
          (context_bound
            (type_identifier)))
        (generic_type
          (type_identifier)
          (type_arguments
            (generic_type
              (type_identifier)
              (type_arguments
                (type_identifier)))))
        (with_template_body
          (function_definition
            (identifier)
            (unit))))
      (given_definition
        (type_identifier)
        (identifier))
      (given_definition
        (generic_type
          (type_identifier)
          (type_arguments
            (type_identifier)))
        (identifier)))))

================================================================================
Top-level Definitions (Scala 3 syntax)
================================================================================

class A:
  def a() =
    ()

def a() = 1

--------------------------------------------------------------------------------

(compilation_unit
  (class_definition
    (identifier)
    (template_body
      (function_definition
        (identifier)
        (parameters)
        (indented_block
          (unit)))))
  (function_definition
    (identifier)
    (parameters)
    (integer_literal)))

================================================================================
Initialization expressions
================================================================================

class A(val x: Int, val y: Int) {
  assert(x != 0)
}

--------------------------------------------------------------------------------

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  (class_definition
    (identifier)
    (class_parameters
      (class_parameter
        (identifier)
        (type_identifier))
      (class_parameter
        (identifier)
        (type_identifier)))
    (template_body
      (call_expression
        (identifier)
        (arguments
          (infix_expression
            (identifier)
            (operator_identifier)
            (integer_literal)))))))

================================================================================
Optional parameters
================================================================================

def mkLines(header: String, indented: Boolean = false, repeated: Long = 0L): String = {}

--------------------------------------------------------------------------------

(compilation_unit
  (function_definition
    (identifier)
    (parameters
      (parameter
        (identifier)
        (type_identifier))
      (parameter
        (identifier)
        (type_identifier)
        (boolean_literal))
      (parameter
        (identifier)
        (type_identifier)
        (integer_literal)))
    (type_identifier)
    (block)))

================================================================================
Enums (Scala 3)
================================================================================

enum Hello[Y] extends java.Enumeration derives Codec, Eq {
  case World, You
  case Test[A](bla: Int, yo: String) extends Hello[A]
  case T extends Hello[String](25)
}

--------------------------------------------------------------------------------

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  (enum_definition
    (identifier)
    (type_parameters
      (identifier))
    (extends_clause
      (stable_type_identifier
        (identifier)
        (type_identifier)))
    (derives_clause
      (type_identifier)
      (type_identifier))
    (enum_body
      (enum_case_definitions
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          (identifier))
        (simple_enum_case
          (identifier)))
      (enum_case_definitions
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          (identifier)
          (type_parameters
            (identifier))
          (class_parameters
            (class_parameter
              (identifier)
              (type_identifier))
            (class_parameter
              (identifier)
              (type_identifier)))
          (extends_clause
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              (type_identifier)
              (type_arguments
                (type_identifier))))))
      (enum_case_definitions
        (simple_enum_case
          (identifier)
          (extends_clause
            (generic_type
              (type_identifier)
              (type_arguments
                (type_identifier)))
            (arguments
              (integer_literal))))))))

================================================================================
Self types
================================================================================

trait A {
  self => 
  def f: Int
}

class B {
  self: Something[A] => 

  case class Hello(a: Int)
}

--------------------------------------------------------------------------------

(compilation_unit
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        (class_parameters
          (class_parameter
            (identifier)
            (type_identifier)))))))

================================================================================
Inline methods and parameters (Scala 3)
================================================================================

inline def mkLines(inline header: String, indented: Boolean = false): String = {}

--------------------------------------------------------------------------------

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  (function_definition
    (modifiers
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      (parameter
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        (type_identifier)
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    (type_identifier)
    (block)))

================================================================================
Inline val (Scala 3)
================================================================================

inline def test() =
  inline val x = true

--------------------------------------------------------------------------------

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        (boolean_literal)))))

================================================================================
Inline given (Scala 3)
================================================================================

inline given Test = 
  new Test

--------------------------------------------------------------------------------

(compilation_unit
  (given_definition
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    (type_identifier)
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      (type_identifier))))

================================================================================
Infix methods (Scala 3)
================================================================================

object Test:
  infix private def hello = 25

--------------------------------------------------------------------------------

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  (object_definition
    (identifier)
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================================================================================
Open classes (Scala 3)
================================================================================

open class Test(a: Int):
  def test = 25
end Test

--------------------------------------------------------------------------------

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================================================================================
Transparent traits (Scala 3)
================================================================================

transparent trait Kind:
  def test = 1

--------------------------------------------------------------------------------

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    (identifier)
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================================================================================
Exports (Scala 3)
================================================================================

export scanUnit.scan
export printUnit.{status as _, *}
export printUnit.Test as Hello
export printUnit.Test as _

--------------------------------------------------------------------------------

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    (identifier))
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      (identifier)))
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