[experiment] Cargo -Zfeatures=itarget crater run

Author: ehuss

.gitmodules

@@ -6,7 +6,8 @@
 	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/ehuss/cargo.git
+	branch = features-crater
 [submodule "src/doc/reference"]
 	path = src/doc/reference
 	url = https://github.com/rust-lang/reference.git