patch 8.2.0753: Vim9: expressions are evaluated in the discovery phase Commit: https://github.com/vim/vim/commit/32e351179eacfc84f64cd5029e221582d400bb38 Author: Bram Moolenaar <Bram@vim.org> Date: Thu May 14 22:41:15 2020 +0200 patch 8.2.0753: Vim9: expressions are evaluated in the discovery phase Problem: Vim9: expressions are evaluated in the discovery phase. Solution: Bail out if an expression is not a constant. Require a type for declared constants.

--- a/src/ex_eval.c
+++ b/src/ex_eval.c
@@ -879,7 +879,8 @@ ex_eval(exarg_T *eap)
 {
     typval_T	tv;
 
-    if (eval0(eap->arg, &tv, &eap->nextcmd, !eap->skip) == OK)
+    if (eval0(eap->arg, &tv, &eap->nextcmd, eap->skip ? 0 : EVAL_EVALUATE)
+									 == OK)
 	clear_tv(&tv);
 }