File: allowed-signatures.rs

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// check-pass
// force-host
// no-prefer-dynamic

#![crate_type = "proc-macro"]
#![allow(private_in_public)]
extern crate proc_macro;
use proc_macro::TokenStream;

#[proc_macro]
pub fn foo<T>(t: T) -> TokenStream {
  TokenStream::new()
}

trait Project {
    type Assoc;
}

impl Project for () {
    type Assoc = TokenStream;
}

#[proc_macro]
pub fn uwu(_input: <() as Project>::Assoc) -> <() as Project>::Assoc {
    TokenStream::new()
}