add unit test case for #1 / GerHobbelt/jison#29 :: Supporting jison r…

…eference location, token and index variables fails for negative indexes
GerHobbelt · Nov 10, 2017 · 1337234 · 1337234
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diff --git a/test/fixtures/jison-actions/jison_0015.js b/test/fixtures/jison-actions/jison_0015.js
@@ -0,0 +1,8 @@
+// test jison negative index reference variables recognition:
+// `$-1` is expected to be parsed as an *expression*, while the others
+// should parse as identifiers...
+$$ = {
+	val: $-1 + a.tx(`blub: ${$$-2} @ ${@@-3} vs. ${##-4}?`),
+	loc: @-5,
+	idx: #-6,
+};