Error code E0466

Macro import declaration was malformed.

Erroneous code examples:

#![allow(unused)] fn main() { #[macro_use(a_macro(another_macro))] // error: invalid import declaration extern crate core as some_crate; #[macro_use(i_want = "some_macros")] // error: invalid import declaration extern crate core as another_crate; }

This is a syntax error at the level of attribute declarations. The proper syntax for macro imports is the following:

// In some_crate: #[macro_export] macro_rules! get_tacos { ... } #[macro_export] macro_rules! get_pimientos { ... } // In your crate: #[macro_use(get_tacos, get_pimientos)] // It imports `get_tacos` and extern crate some_crate; // `get_pimientos` macros from some_crate

If you would like to import all exported macros, write macro_use with no arguments.