hush: fix shift + $0 bug; add testcase
diff --git a/shell/hush_test/hush-misc/shift.right b/shell/hush_test/hush-misc/shift.right
new file mode 100644
index 0000000..afb90be
--- /dev/null
+++ b/shell/hush_test/hush-misc/shift.right
@@ -0,0 +1,2 @@
+./shift.tests abc d e
+./shift.tests d e