From 60ce10ad84d7f74c44e3a7660fe9824c3fe9d112 Mon Sep 17 00:00:00 2001
From: Fabian Homborg <FHomborg@gmail.com>
Date: Tue, 5 Mar 2019 21:10:11 +0100
Subject: [PATCH] functions/eval: Return 0 for empty arguments

Fixes #5692.
---
 share/functions/eval.fish | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/share/functions/eval.fish b/share/functions/eval.fish
index fc5f5aef4..20910e944 100644
--- a/share/functions/eval.fish
+++ b/share/functions/eval.fish
@@ -17,6 +17,12 @@ function eval -S -d "Evaluate parameters as a command"
         end
     end
 
+    if not string length -q -- $argv
+        # If the argument is empty, eval should return 0 for compatibility with other shells.
+        # See #5692.
+        return 0
+    end
+
     # If we are in an interactive shell, eval should enable full
     # job control since it should behave like the real code was
     # executed.  If we don't do this, commands that expect to be