rust/tests/ui/macros/macro-metavar-expr-concat/syntax-errors.rs

#![feature(macro_metavar_expr_concat)]

macro_rules! wrong_concat_declarations {
    ($ex:expr) => {
        ${concat()}
        //~^ ERROR expected identifier

        ${concat(aaaa)}
        //~^ ERROR `concat` must have at least two elements

        ${concat(aaaa,)}
        //~^ ERROR expected identifier

        ${concat(_, aaaa)}

        ${concat(aaaa aaaa)}
        //~^ ERROR expected comma

        ${concat($ex)}
        //~^ ERROR `concat` must have at least two elements

        ${concat($ex, aaaa)}
        //~^ ERROR `${concat(..)}` currently only accepts identifiers

        ${concat($ex, aaaa 123)}
        //~^ ERROR expected comma

        ${concat($ex, aaaa,)}
        //~^ ERROR expected identifier
    };
}

macro_rules! dollar_sign_without_referenced_ident {
    ($ident:ident) => {
        const ${concat(FOO, $foo)}: i32 = 2;
        //~^ ERROR variable `foo` is not recognized in meta-variable expression
    };
}

macro_rules! starting_number {
    ($ident:ident) => {{
        let ${concat("1", $ident)}: () = ();
        //~^ ERROR `${concat(..)}` is not generating a valid identifier
    }};
}

macro_rules! starting_valid_unicode {
    ($ident:ident) => {{
        let ${concat("Ý", $ident)}: () = ();
    }};
}

macro_rules! starting_invalid_unicode {
    ($ident:ident) => {{
        let ${concat("\u{00BD}", $ident)}: () = ();
        //~^ ERROR `${concat(..)}` is not generating a valid identifier
    }};
}

macro_rules! ending_number {
    ($ident:ident) => {{
        let ${concat($ident, "1")}: () = ();
    }};
}

macro_rules! ending_valid_unicode {
    ($ident:ident) => {{
        let ${concat($ident, "Ý")}: () = ();
    }};
}

macro_rules! ending_invalid_unicode {
    ($ident:ident) => {{
        let ${concat($ident, "\u{00BD}")}: () = ();
        //~^ ERROR `${concat(..)}` is not generating a valid identifier
    }};
}

macro_rules! empty {
    () => {{
        let ${concat("", "")}: () = ();
        //~^ ERROR `${concat(..)}` is not generating a valid identifier
    }};
}

macro_rules! unsupported_literals {
    ($ident:ident) => {{
        let ${concat(_a, 'b')}: () = ();
        //~^ ERROR expected identifier or string literal
        //~| ERROR expected pattern
        let ${concat(_a, 1)}: () = ();
        //~^ ERROR expected identifier or string literal

        let ${concat($ident, 'b')}: () = ();
        //~^ ERROR expected identifier or string literal
        let ${concat($ident, 1)}: () = ();
        //~^ ERROR expected identifier or string literal
    }};
}

fn main() {
    wrong_concat_declarations!(1);

    dollar_sign_without_referenced_ident!(VAR);

    starting_number!(_abc);
    starting_valid_unicode!(_abc);
    starting_invalid_unicode!(_abc);

    ending_number!(_abc);
    ending_valid_unicode!(_abc);
    ending_invalid_unicode!(_abc);
    unsupported_literals!(_abc);

    empty!();
}