Cannot register a singleton wrapped in Arc<_>

[m1guelpf]

Use-case

In order to register a Singleton, the base type must implement Clone. To prevent unnecessary cloning, it makes sense to use a pointer instead.

Repro

I've created a new repo with a single commit on top of the base pavex new installation, showcasing the issue: https://github.com/m1guelpf/pavex_arc_repro/commit/f4b5abc51b8f166a24ff5523da15a1b1420847ed. Running cargo px run on the root of this repo fails with the following error:

error[E0433]: failed to resolve: use of undeclared crate or module `alloc`
  --> arc_repro_server_sdk/src/lib.rs:97:13
   |
97 |         v1: alloc::sync::Arc<arc_repro::ExampleDependency>,
   |             ^^^^^ use of undeclared crate or module `alloc`
   |
   = help: add `extern crate alloc` to use the `alloc` crate
help: consider importing one of these items
   |
95 +     use crate::alloc::sync;
   |
95 +     use std::sync;
   |
help: if you import `sync`, refer to it directly
   |
97 -         v1: alloc::sync::Arc<arc_repro::ExampleDependency>,
97 +         v1: sync::Arc<arc_repro::ExampleDependency>,
   |

error[E0433]: failed to resolve: use of undeclared crate or module `alloc`
   --> arc_repro_server_sdk/src/lib.rs:109:13
    |
109 |         v0: alloc::sync::Arc<arc_repro::ExampleDependency>,
    |             ^^^^^ use of undeclared crate or module `alloc`
    |
    = help: add `extern crate alloc` to use the `alloc` crate
help: consider importing one of these items
    |
95  +     use crate::alloc::sync;
    |
95  +     use std::sync;
    |
help: if you import `sync`, refer to it directly
    |
109 -         v0: alloc::sync::Arc<arc_repro::ExampleDependency>,
109 +         v0: sync::Arc<arc_repro::ExampleDependency>,
    |

error[E0433]: failed to resolve: use of undeclared crate or module `alloc`
   --> arc_repro_server_sdk/src/lib.rs:118:14
    |
118 |         s_0: alloc::sync::Arc<arc_repro::ExampleDependency>,
    |              ^^^^^ use of undeclared crate or module `alloc`
    |
    = help: add `extern crate alloc` to use the `alloc` crate
help: consider importing one of these items
    |
95  +     use crate::alloc::sync;
    |
95  +     use std::sync;
    |
help: if you import `sync`, refer to it directly
    |
118 -         s_0: alloc::sync::Arc<arc_repro::ExampleDependency>,
118 +         s_0: sync::Arc<arc_repro::ExampleDependency>,
    |

error[E0433]: failed to resolve: use of undeclared crate or module `alloc`
   --> arc_repro_server_sdk/src/lib.rs:119:18
    |
119 |         next: fn(alloc::sync::Arc<arc_repro::ExampleDependency>) -> T,
    |                  ^^^^^ use of undeclared crate or module `alloc`
    |
    = help: add `extern crate alloc` to use the `alloc` crate
help: consider importing one of these items
    |
95  +     use crate::alloc::sync;
    |
95  +     use std::sync;
    |
help: if you import `sync`, refer to it directly
    |
119 -         next: fn(alloc::sync::Arc<arc_repro::ExampleDependency>) -> T,
119 +         next: fn(sync::Arc<arc_repro::ExampleDependency>) -> T,

[m1guelpf]

Updated to the latest commit and this seems to still be an issue: https://github.com/m1guelpf/pavex_arc_repro/commit/673e0ce698e35ffb18fa3a84a8a24efdb3dd5885

[LukeMathWalker]

I can't reproduce 🤔 If I git pull and cargo px c on that commit it works just fine. Did you regenerate the SDK via a cargo px command?

[m1guelpf]

For future reference, I had forgotten to update the CLI to the latest commit 😅