rust/tests/ui/rfcs/rfc-2565-param-attrs/auxiliary/param-attrs.rs

extern crate proc_macro;

use proc_macro::TokenStream;

macro_rules! checker {
    ($attr_name:ident, $expected:literal) => {
        #[proc_macro_attribute]
        pub fn $attr_name(attr: TokenStream, input: TokenStream) -> TokenStream {
            assert_eq!(input.to_string(), $expected);
            TokenStream::new()
        }
    }
}

checker!(attr_extern, r#"extern "C" { fn ffi(#[a1] arg1: i32, #[a2] ...); }"#);
checker!(attr_extern_cvar, r#"unsafe extern "C" fn cvar(arg1: i32, #[a1] mut args: ...) {}"#);
checker!(attr_alias, "type Alias = fn(#[a1] u8, #[a2] ...);");
checker!(attr_free, "fn free(#[a1] arg1: u8) { let lam = |#[a2] W(x), #[a3] y| (); }");
checker!(attr_inherent_1, "fn inherent1(#[a1] self, #[a2] arg1: u8) {}");
checker!(attr_inherent_2, "fn inherent2(#[a1] &self, #[a2] arg1: u8) {}");
checker!(attr_inherent_3, "fn inherent3<'a>(#[a1] &'a mut self, #[a2] arg1: u8) {}");
checker!(attr_inherent_4, "fn inherent4<'a>(#[a1] self: Box<Self>, #[a2] arg1: u8) {}");
checker!(attr_inherent_issue_64682, "fn inherent5(#[a1] #[a2] arg1: u8, #[a3] arg2: u8) {}");
checker!(attr_trait_1, "fn trait1(#[a1] self, #[a2] arg1: u8);");
checker!(attr_trait_2, "fn trait2(#[a1] &self, #[a2] arg1: u8);");
checker!(attr_trait_3, "fn trait3<'a>(#[a1] &'a mut self, #[a2] arg1: u8);");
checker!(attr_trait_4, r#"fn trait4<'a>(#[a1] self: Box<Self>, #[a2] arg1: u8, #[a3] Vec<u8>);"#);
checker!(attr_trait_issue_64682, "fn trait5(#[a1] #[a2] arg1: u8, #[a3] arg2: u8);");
checker!(rename_params, r#"impl Foo
{
    fn hello(#[angery(true)] a: i32, #[a2] b: i32, #[what = "how"] c: u32) {}
    fn
    hello2(#[a1] #[a2] a: i32, #[what = "how"] b: i32, #[angery(true)] c: u32)
    {} fn
    hello_self(#[a1] #[a2] &self, #[a1] #[a2] a: i32, #[what = "how"] b: i32,
    #[angery(true)] c: u32) {}
}"#);