[EXPERIMENT] using my branch to test

Author: weihanglo

Diff for: .gitmodules

@@ -3,7 +3,8 @@
 	url = https://github.com/rust-lang/nomicon.git
 [submodule "src/tools/cargo"]
 	path = src/tools/cargo
-	url = https://github.com/rust-lang/cargo.git
+	url = https://github.com/weihanglo/cargo.git
+	branch = make-cargo-a-workspace
 [submodule "src/doc/reference"]
 	path = src/doc/reference
 	url = https://github.com/rust-lang/reference.git