patch 8.2.2789: Vim9: using =expr in :substitute does not handle jumps Commit: https://github.com/vim/vim/commit/8238f08838c0b481d0b14a741bc03f2e45c211d3 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Apr 20 21:10:48 2021 +0200 patch 8.2.2789: Vim9: using \=expr in :substitute does not handle jumps Problem: Vim9: using \=expr in :substitute does not handle jumps. Solution: Start with instruction count zero. (closes https://github.com/vim/vim/issues/8128)

--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -1188,6 +1188,12 @@ def Test_substitute_expr()
   s/from/\=to .. '_' .. also/g#e
   assert_equal('one repl_also two repl_also three', getline(1))
 
+  setline(1, 'abc abc abc')
+  for choice in [true, false]
+    :1s/abc/\=choice ? 'yes' : 'no'/
+  endfor
+  assert_equal('yes no abc', getline(1))
+
   CheckDefFailure(['s/from/\="x")/'], 'E488:')
   CheckDefFailure(['s/from/\="x"/9'], 'E488:')