commit bc7ce675b2d1c9fb58c067eff3edd59abc30aba4
author Bram Moolenaar <Bram@vim.org> Mon Aug 01 22:49:22 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Mon Aug 01 22:49:22 2016 +0200
tree df3fc4f3d1467680240f95d5cf51d65eae88cb86
parent 8dd3a43d75550e9b5736066124c97697564f769e

patch 7.4.2143
Problem:    A funccal is garbage collected while it can still be used.
Solution:   Set copyID in all referenced functions.  Do not list lambda
            functions with ":function".

src/eval.c

diff --git a/src/eval.c b/src/eval.c
index 1adbabc..45b8f07 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -5304,6 +5304,9 @@
     /* function-local variables */
     abort = abort || set_ref_in_call_stack(copyID);
 
+    /* named functions (matters for closures) */
+    abort = abort || set_ref_in_functions(copyID);
+
     /* function call arguments, if v:testing is set. */
     abort = abort || set_ref_in_func_args(copyID);