rust/tests/ui/macros/unknown-builtin.rs

// error-pattern: attempted to define built-in macro more than once

#![feature(rustc_attrs)]

#[rustc_builtin_macro]
macro_rules! unknown { () => () } //~ ERROR cannot find a built-in macro with name `unknown`

#[rustc_builtin_macro]
macro_rules! line { () => () } //~ NOTE previously defined here

fn main() {
    line!();
    std::prelude::v1::line!();
}
Give a better error message for duplicate built-in macros Previously, this would say no such macro existed, but this was misleading, since the macro _did_ exist, it was just already seen. - Say where the macro was previously defined - Add long-form error message 2020-08-31 04:04:01 +00:00			`// error-pattern: attempted to define built-in macro more than once`
Introduce built-in macros through libcore 2019-06-20 08:52:31 +00:00
			`#![feature(rustc_attrs)]`

			`#[rustc_builtin_macro]`
			macro_rules! unknown { () => () } //~ ERROR cannot find a built-in macro with name `unknown`

			`#[rustc_builtin_macro]`
Give a better error message for duplicate built-in macros Previously, this would say no such macro existed, but this was misleading, since the macro _did_ exist, it was just already seen. - Say where the macro was previously defined - Add long-form error message 2020-08-31 04:04:01 +00:00			`macro_rules! line { () => () } //~ NOTE previously defined here`
Introduce built-in macros through libcore 2019-06-20 08:52:31 +00:00
			`fn main() {`
			`line!();`
			`std::prelude::v1::line!();`
			`}`