unresolved-method of impl IntoIterator<Item=...> as return type

[boozook]

rust-analyzer version: 0.4.1493-standalone (237ffa3 2023-04-27)

rustc version: rustc 1.70.0-nightly (84dd17b56 2023-04-14)

Unfortunately I can't isolate it right now, but probably that will be easy:

• use cargo crate
• create config = cargo::util::config::Config::default()
• create workspace = cargo::core::workspace::Workspace::new(&manifest_path, &*config)
• call this with workspace.members(), e.g.: filter_packages_with_metadata(workspace.members())
  Something like this. 🙄

Code from screenshot

fn filter_packages_with_metadata<'i, I: Iterator<Item = &'i Package> + 'i>(iter: I) -> Vec<(PackageId, toml::Value)> {
	filter_packages_with_metadata_iter(iter).into_iter().collect()
}

fn filter_packages_with_metadata_iter<'i, I>(iter: I) -> impl IntoIterator<Item = (PackageId, toml::Value)> + 'i
	where I: Iterator<Item = &'i Package> + 'i {
	iter.filter_map(|p| {
		    p.manifest()
		     .custom_metadata()
		     .map(|meta| {
			     meta.as_table()
			         .map(|t| t.get("my-metadata"))
			         .flatten()
			         .map(|meta| (p.package_id(), meta))
		     })
		     .flatten()
	    })
	    .filter_map(|(id, v)| toml::Value::try_from(v).ok().map(|v| (id, v)))
}

[lowr]

This is a chalk issue. Minimum repro:

fn foo() -> impl IntoIterator<Item = ()> {
    []
}

fn test() {
    let v: Vec<_> = foo().into_iter().collect();
                  //^^^^^^^^^^^^^^^^^^^^^^^^^^^ unresolved method
}

[Veykril]

Fixed by rust-lang/chalk#795