1 files changed, 15 insertions, 0 deletions
diff --git a/test/functional/legacy/set_spec.lua b/test/functional/legacy/set_spec.lua
index f81fcd3700..f2c907084e 100644
--- a/test/functional/legacy/set_spec.lua
+++ b/test/functional/legacy/set_spec.lua
@@ -7,6 +7,21 @@ local clear, execute, eval, eq =
 describe(':set', function()
   before_each(clear)
 
+  it('handles backslash properly', function()
+    execute('set iskeyword=a,b,c')
+    execute('set iskeyword+=d')
+    eq('a,b,c,d', eval('&iskeyword'))
+
+    execute([[set iskeyword+=\\,e]])
+    eq([[a,b,c,d,\,e]], eval('&iskeyword'))
+
+    execute('set iskeyword-=e')
+    eq([[a,b,c,d,\]], eval('&iskeyword'))
+
+    execute([[set iskeyword-=\]])
+    eq('a,b,c,d', eval('&iskeyword'))
+  end)
+
   it('recognizes a trailing comma with +=', function()
     execute('set wildignore=*.png,')
     execute('set wildignore+=*.jpg')