macro_rules! type_feature_error {
($ctx: expr, $loc: expr, $name: expr) => { ... };
(error $ctx: expr, $loc: expr, $name: expr) => { ... };
}
macro_rules! type_feature_error {
($ctx: expr, $loc: expr, $name: expr) => { ... };
(error $ctx: expr, $loc: expr, $name: expr) => { ... };
}