[master] 97c1722 Restore regression test for #2184

[Dridi Boukelmoune]

commit 97c1722e7f73d98a106d5e5a442723e4405f04ad
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Feb 21 14:09:26 2017 +0100

    Restore regression test for #2184
    
    Introduced in 7c9916a, its precise syntax got lost in polishing.

diff --git a/bin/varnishtest/tests/v00020.vtc b/bin/varnishtest/tests/v00020.vtc
index 5f734fc..faf25f0 100644
--- a/bin/varnishtest/tests/v00020.vtc
+++ b/bin/varnishtest/tests/v00020.vtc
@@ -83,6 +83,7 @@ varnish v1 -vcl {
 		set req.http.foo = 1 - 1;
 		set req.http.foo = 1 + -1;
 		set req.http.foo = 1 - -1;
+		set req.http.foo = 1- -1; # regression test for #2184
 		set req.http.foo = 3 * 2;
 		set req.http.foo = 3 / 2;
 		set req.http.foo = 3 * -2;