Remove --all from cargo package.

src/bin/cargo/commands/package.rs

@@ -28,7 +28,7 @@ pub fn cli() -> App {
         .arg_target_triple("Build for the target triple")
         .arg_target_dir()
         .arg_features()
-        .arg_package_spec(
+        .arg_package_spec_no_all(
             "Package(s) to assemble",
             "Assemble all packages in the workspace",
             "Don't assemble specified packages",

src/cargo/util/command_prelude.rs

@@ -27,6 +27,8 @@ pub type App = clap::App<'static, 'static>;
 pub trait AppExt: Sized {
     fn _arg(self, arg: Arg<'static, 'static>) -> Self;
 
+    /// Do not use this method, it is only for backwards compatibility.
+    /// Use `arg_package_spec_no_all` instead.
     fn arg_package_spec(
         self,
         package: &'static str,