Make sure the global namespace is always searched first.

src/packages/pkg_std.rs

@@ -13,6 +13,8 @@ use std::prelude::v1::*;
 use crate::def_package;
 
 def_package!(crate:StandardPackage:"_Standard_ package containing all built-in features.", lib, {
+    lib.standard = true;
+
     CorePackage::init(lib);
     BasicMathPackage::init(lib);
     #[cfg(not(feature = "no_index"))]