From 8ba3354d74a8f90ded0997100bdbe845a8c5382f Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Wed, 15 Jan 2020 09:08:22 +0100
Subject: [PATCH] api_set_error: include expression with "Failed to evaluate
 expression" (#11713)

---
 src/nvim/api/vim.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index d35d04cdb3..baa0387fd8 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -443,7 +443,8 @@ Object nvim_eval(String expr, Error *err)
   if (!try_end(err)) {
     if (ok == FAIL) {
       // Should never happen, try_end() should get the error. #8371
-      api_set_error(err, kErrorTypeException, "Failed to evaluate expression");
+      api_set_error(err, kErrorTypeException,
+                    "Failed to evaluate expression: '%.*s'", 256, expr.data);
     } else {
       rv = vim_to_object(&rettv);
     }