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|
// General syntax errors that apply to all matavariable expressions
//
// We don't invoke the macros here to ensure code gets rejected at the definition rather than
// only when expanded.
#![feature(macro_metavar_expr)]
macro_rules! dollar_dollar_in_the_lhs {
( $$ $a:ident ) => {
//~^ ERROR unexpected token: $
};
}
macro_rules! metavar_in_the_lhs {
( ${ len() } ) => {
//~^ ERROR unexpected token: {
//~| ERROR expected one of: `*`, `+`, or `?`
};
}
macro_rules! metavar_token_without_ident {
( $( $i:ident ),* ) => { ${ ignore() } };
//~^ ERROR meta-variable expressions must be referenced using a dollar sign
}
macro_rules! metavar_with_literal_suffix {
( $( $i:ident ),* ) => { ${ index(1u32) } };
//~^ ERROR only unsuffixes integer literals are supported in meta-variable expressions
}
macro_rules! mve_without_parens {
( $( $i:ident ),* ) => { ${ count } };
//~^ ERROR expected `(`
}
#[rustfmt::skip]
macro_rules! empty_expression {
() => { ${} };
//~^ ERROR expected identifier or string literal
}
#[rustfmt::skip]
macro_rules! open_brackets_with_lit {
() => { ${ "hi" } };
//~^ ERROR expected identifier
}
macro_rules! mvs_missing_paren {
( $( $i:ident ),* ) => { ${ count $i ($i) } };
//~^ ERROR expected `(`
}
macro_rules! mve_wrong_delim {
( $( $i:ident ),* ) => { ${ count{i} } };
//~^ ERROR expected `(`
}
macro_rules! invalid_metavar {
() => { ${ignore($123)} }
//~^ ERROR expected identifier, found `123`
}
#[rustfmt::skip]
macro_rules! open_brackets_with_group {
( $( $i:ident ),* ) => { ${ {} } };
//~^ ERROR expected identifier
}
macro_rules! extra_garbage_after_metavar {
( $( $i:ident ),* ) => {
${count() a b c}
//~^ ERROR unexpected trailing tokens
${count($i a b c)}
//~^ ERROR unexpected trailing tokens
${count($i, 1 a b c)}
//~^ ERROR unexpected trailing tokens
${count($i) a b c}
//~^ ERROR unexpected trailing tokens
${ignore($i) a b c}
//~^ ERROR unexpected trailing tokens
${ignore($i a b c)}
//~^ ERROR unexpected trailing tokens
${index() a b c}
//~^ ERROR unexpected trailing tokens
${index(1 a b c)}
//~^ ERROR unexpected trailing tokens
${index() a b c}
//~^ ERROR unexpected trailing tokens
${index(1 a b c)}
//~^ ERROR unexpected trailing tokens
${index(1, a b c)}
//~^ ERROR unexpected trailing tokens
};
}
const IDX: usize = 1;
macro_rules! metavar_depth_is_not_literal {
( $( $i:ident ),* ) => { ${ index(IDX) } };
//~^ ERROR meta-variable expression depth must be a literal
}
macro_rules! unknown_count_ident {
( $( $i:ident )* ) => {
${count(foo)}
//~^ ERROR meta-variable expressions must be referenced using a dollar sign
};
}
macro_rules! unknown_ignore_ident {
( $( $i:ident )* ) => {
${ignore(bar)}
//~^ ERROR meta-variable expressions must be referenced using a dollar sign
};
}
macro_rules! unknown_metavar {
( $( $i:ident ),* ) => { ${ aaaaaaaaaaaaaa(i) } };
//~^ ERROR unrecognized metavariable expression
}
fn main() {}
|
