[vim/vim] vim9class can't use this keyword in lambda function (Issue #12336)

[Shinya Ohyanagi]

Steps to reproduce

vim9script

class Counter
  this.counter = 10
  def new()
  enddef

  def Up()
    timer_start(1000, (_time) => {
      echomsg this.counter
      this.counter = this.counter + 1
    }, { repeat: -1 })
  enddef
endclass

const counter = Counter.new()
counter.Up()

1. open Vim and :so %
2. Error shows

Error detected while compiling /tmp/a.vim[17]..function Up[1]..<lambda>68:
line    2:
E1034: Cannot use reserved name this

If I remove this.counter = this.counter + 1 line, no error raised.

Expected behaviour

It would be great if this keyword can use in lambda function like JavaScript's arrow function this.

Notes:

I know I can use like followings

vim9script

class Counter
  this.counter = 10
  def new()
  enddef

  def Up()
    const self = this
    timer_start(1000, (_time) => {
      echomsg self.counter
      self.counter = self.counter + 1
    }, { repeat: -1 })
  enddef
endclass

const counter = Counter.new()
counter.Up()

Version of Vim

Vim9.1474

Environment

OS: macOS
Terminal: Terminal.app
value of $TERM: xterm-256color
shell: zsh

Logs and stack traces

No response

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[Rodgers Nyakundi]

Vimscript "this" is a reserved keyword referring to the current object same to "self" in other programming language. to fix it rename "this" to something else eg self or obj

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[Bram Moolenaar]

Looks like a duplicate of #12076. If you agree you can close this issue.

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[Bram Moolenaar]

Closed #12336 as completed via 2bd6a09.

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