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#![feature(macro_metavar_expr)]
// `curly` = Right hand side curly brackets
// `no_rhs_dollar` = No dollar sign at the right hand side meta variable "function"
// `round` = Left hand side round brackets
macro_rules! curly__no_rhs_dollar__round {
( $( $i:ident ),* ) => { ${ count(i) } };
}
macro_rules! curly__no_rhs_dollar__no_round {
( $i:ident ) => { ${ count(i) } };
//~^ ERROR `count` can not be placed inside the inner-most repetition
}
macro_rules! curly__rhs_dollar__round {
( $( $i:ident ),* ) => { ${ count($i) } };
//~^ ERROR expected identifier, found `$`
//~| ERROR expected expression, found `$`
}
macro_rules! curly__rhs_dollar__no_round {
( $i:ident ) => { ${ count($i) } };
//~^ ERROR expected identifier, found `$`
//~| ERROR expected expression, found `$`
}
macro_rules! no_curly__no_rhs_dollar__round {
( $( $i:ident ),* ) => { count(i) };
//~^ ERROR cannot find function `count` in this scope
//~| ERROR cannot find value `i` in this scope
}
macro_rules! no_curly__no_rhs_dollar__no_round {
( $i:ident ) => { count(i) };
//~^ ERROR cannot find function `count` in this scope
//~| ERROR cannot find value `i` in this scope
}
macro_rules! no_curly__rhs_dollar__round {
( $( $i:ident ),* ) => { count($i) };
//~^ ERROR variable 'i' is still repeating at this depth
}
macro_rules! no_curly__rhs_dollar__no_round {
( $i:ident ) => { count($i) };
//~^ ERROR cannot find function `count` in this scope
}
// Other scenarios
macro_rules! dollar_dollar_in_the_lhs {
( $$ $a:ident ) => {
//~^ ERROR unexpected token: $
};
}
macro_rules! extra_garbage_after_metavar {
( $( $i:ident ),* ) => {
${count() a b c}
//~^ ERROR unexpected token: a
//~| ERROR expected expression, found `$`
${count(i a b c)}
//~^ ERROR unexpected token: a
${count(i, 1 a b c)}
//~^ ERROR unexpected token: a
${count(i) a b c}
//~^ ERROR unexpected token: a
${ignore(i) a b c}
//~^ ERROR unexpected token: a
${ignore(i a b c)}
//~^ ERROR unexpected token: a
${index() a b c}
//~^ ERROR unexpected token: a
${index(1 a b c)}
//~^ ERROR unexpected token: a
${index() a b c}
//~^ ERROR unexpected token: a
${index(1 a b c)}
//~^ ERROR unexpected token: a
};
}
const IDX: usize = 1;
macro_rules! metavar_depth_is_not_literal {
( $( $i:ident ),* ) => { ${ index(IDX) } };
//~^ ERROR meta-variable expression depth must be a literal
//~| ERROR expected expression, found `$`
}
macro_rules! metavar_in_the_lhs {
( ${ length() } ) => {
//~^ ERROR unexpected token: {
//~| ERROR expected one of: `*`, `+`, or `?`
};
}
macro_rules! metavar_token_without_ident {
( $( $i:ident ),* ) => { ${ ignore() } };
//~^ ERROR expected identifier
//~| ERROR expected expression, found `$`
}
macro_rules! metavar_with_literal_suffix {
( $( $i:ident ),* ) => { ${ index(1u32) } };
//~^ ERROR only unsuffixes integer literals are supported in meta-variable expressions
//~| ERROR expected expression, found `$`
}
macro_rules! metavar_without_parens {
( $( $i:ident ),* ) => { ${ count{i} } };
//~^ ERROR meta-variable expression parameter must be wrapped in parentheses
//~| ERROR expected expression, found `$`
}
macro_rules! open_brackets_without_tokens {
( $( $i:ident ),* ) => { ${ {} } };
//~^ ERROR expected expression, found `$`
//~| ERROR expected identifier
}
macro_rules! unknown_count_ident {
( $( $i:ident )* ) => {
${count(foo)}
//~^ ERROR variable `foo` is not recognized in meta-variable expression
};
}
macro_rules! unknown_ignore_ident {
( $( $i:ident )* ) => {
${ignore(bar)}
//~^ ERROR variable `bar` is not recognized in meta-variable expression
};
}
macro_rules! unknown_metavar {
( $( $i:ident ),* ) => { ${ aaaaaaaaaaaaaa(i) } };
//~^ ERROR unrecognized meta-variable expression
//~| ERROR expected expression
}
fn main() {
curly__no_rhs_dollar__round!(a, b, c);
curly__no_rhs_dollar__no_round!(a);
curly__rhs_dollar__round!(a, b, c);
curly__rhs_dollar__no_round!(a);
no_curly__no_rhs_dollar__round!(a, b, c);
no_curly__no_rhs_dollar__no_round!(a);
no_curly__rhs_dollar__round!(a, b, c);
no_curly__rhs_dollar__no_round!(a);
//~^ ERROR cannot find value `a` in this scope
extra_garbage_after_metavar!(a);
metavar_depth_is_not_literal!(a);
metavar_token_without_ident!(a);
metavar_with_literal_suffix!(a);
metavar_without_parens!(a);
open_brackets_without_tokens!(a);
unknown_count_ident!(a);
unknown_ignore_ident!(a);
unknown_metavar!(a);
}
|
