Change variable name to avoid overwriting

Author: penelopeysm

test/varinfo.jl

@@ -115,9 +115,9 @@ end
             @test ~isempty(vi)
         end
 
-        vi = VarInfo()
-        test_base(vi)
-        test_base(DynamicPPL.typed_varinfo(vi))
+        empty_vi = VarInfo()
+        test_base(empty_vi)
+        test_base(DynamicPPL.typed_varinfo(empty_vi))
         test_base(SimpleVarInfo())
         test_base(SimpleVarInfo(Dict()))
         test_base(SimpleVarInfo(DynamicPPL.VarNamedVector()))