Can't get embassy_hello_world example to compile

[yanshay]

I'm trying to get the embassy_hello_world example to compile and can't make it compile.
The error I get is below.

   Compiling embassy-nostd v0.1.0 (/Users/my_user/Trials/esp32/embassy-nostd)
error[E0433]: failed to resolve: could not find `executor` in `embassy`
  --> src/main.rs:29:1
   |
29 | #[main]
   | ^^^^^^^ could not find `executor` in `embassy`
   |
   = note: this error originates in the attribute macro `main` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this struct
   |
10 + use embassy_executor::raw::Executor;
   |

error[E0282]: type annotations needed
  --> src/main.rs:29:1
   |
29 | #[main]
   | ^^^^^^^ cannot infer type
   |
   = note: this error originates in the attribute macro `main` (in Nightly builds, run with -Z macro-backtrace for more info)

What I did is:

1. Started from a blank template project
2. Reverse engineered the dependencies from the Cargo.toml for the example, eventually I ended up with (though tried many variants along the way):

hal = { package = "esp32-hal", version = "0.16.0", features = ["embassy", "async", "embassy-time-timg0"] }
esp-backtrace = { version = "0.9.0", features = ["esp32", "panic-handler", "exception-handler", "print-uart"] }
esp-println = { version = "0.7.0", features = ["esp32","log"] }
log = { version = "0.4.18" }
esp-alloc = { version = "0.3.0" }
esp-wifi  = { git = "https://github.com/esp-rs/esp-wifi/", rev = "7632e74", features = ["esp32", "wifi"] }
smoltcp = { version = "0.10.0", default-features=false, features = ["proto-igmp", "proto-ipv4", "socket-tcp", "socket-icmp", "socket-udp", "medium-ethernet", "proto-dhcpv4", "socket-raw", "socket-dhcpv4"] }
embedded-svc = { version = "0.26.2", default-features = false, features = [] }
embedded-io = "0.6.1"
heapless = { version = "0.8.0", default-features = false }


# Added /Changed for this project
embassy-time = { version = "0.1.5", features = ["nightly"] }
esp-hal-procmacros = { version = "0.7.0", features = ["esp32", "embassy","enum-dispatch", "ram"] }
embassy-executor = { version= "0.3.2", features = ["integrated-timers", "nightly"] }
esp-hal-common = {version="0.13.1", features = ["esp32" ]}
esp32   = { version = "0.27.0", features = ["critical-section"], optional = true }

What am I doing wrong/missing?

[jessebraham]

For Xtensa devices you additionally need to select an executor via the embassy-executor-interrupt or embassy-executor-thread features. I suppose we need some additional documentation regarding this, sorry about that.

@bugadani can maybe provide some additional context here.

[bugadani]

I guess we could also default-enable embassy-executor-thread if we can find a nice way to make it optional.