commit 75a1a9415b9c207de5a29b25c0d1949c6c9c5c61
author Bram Moolenaar <Bram@vim.org> Thu Jun 20 03:45:36 2019 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Jun 20 03:45:36 2019 +0200
tree 470a0887aed4e52e342edbca555e0bec1b85af99
parent a3fce62c911c204ae144b55018f6dc9295088850

patch 8.1.1575: callbacks may be garbage collected

Problem:    Callbacks may be garbage collected.
Solution:   Set reference in callbacks. (Ozaki Kiichi, closes #4564)

src/testdir/test_prompt_buffer.vim

diff --git a/src/testdir/test_prompt_buffer.vim b/src/testdir/test_prompt_buffer.vim
index 58be50b..028f337 100644
--- a/src/testdir/test_prompt_buffer.vim
+++ b/src/testdir/test_prompt_buffer.vim
@@ -102,3 +102,24 @@
   call StopVimInTerminal(buf)
   call delete(scriptName)
 endfunc
+
+func Test_prompt_garbage_collect()
+  func MyPromptCallback(x, text)
+    " NOP
+  endfunc
+  func MyPromptInterrupt(x)
+    " NOP
+  endfunc
+
+  new
+  set buftype=prompt
+  call prompt_setcallback(bufnr(''), function('MyPromptCallback', [{}]))
+  call prompt_setinterrupt(bufnr(''), function('MyPromptInterrupt', [{}]))
+  call test_garbagecollect_now()
+  " Must not crash
+  call feedkeys("\<CR>\<C-C>", 'xt')
+  call assert_true(v:true)
+
+  delfunc MyPromptCallback
+  bwipe!
+endfunc