vim-patch:7.4.1137

Problem:    Illegal memory access when using :copen and :cclose.
Solution:   Avoid that curbuf is invalid. (suggestion by Justin M. Keyes)
            Add a test.

62ef797496

test/functional/legacy/quickfix_spec.lua

@@ -0,0 +1,18 @@
+-- Test for the quickfix commands.
+
+local helpers = require('test.functional.helpers')
+local insert, source = helpers.insert, helpers.source
+local clear, expect = helpers.clear, helpers.expect
+
+describe('helpgrep', function()
+  before_each(clear)
+
+  it('works', function()
+    source([[
+      helpgrep quickfix
+      copen
+      " This wipes out the buffer, make sure that doesn't cause trouble.
+      cclose
+    ]])
+  end)
+end)