[vim/vim] Vim hangs with memory leak (Issue #21144)

[SectionCotangentBundle]

SectionCotangentBundle created an issue (vim/vim#21144)

Steps to reproduce

Write `bug.vim' containing:

vim9script
echo getpid()
echo []
  ->((_) => [])()
echo []
  \ ->((_) => [])()

And then execute vim --clean bug.vim.

Expected behaviour

[]
[]

But the Vim process hangs infinitely with memory leak.

Version of Vim

9.2.1001

Environment

Windows, Windows Terminal
gvim has the same issue. Terminal or shell is probably irrelevant.

Logs and stack traces

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