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// aux-build:test-macros.rs
// gate-test-proc_macro_hygiene
#![feature(stmt_expr_attributes)]
#[macro_use]
extern crate test_macros;
fn _test_inner() {
#![empty_attr] //~ ERROR: non-builtin inner attributes are unstable
}
#[empty_attr] //~ ERROR: custom attributes cannot be applied to modules
mod _test2 {}
mod _test2_inner {
#![empty_attr] //~ ERROR: custom attributes cannot be applied to modules
//~| ERROR: non-builtin inner attributes are unstable
}
#[empty_attr = "y"] //~ ERROR: must only be followed by a delimiter token
fn _test3() {}
fn attrs() {
// Statement, item
#[empty_attr] // OK
struct S;
// Statement, macro
#[empty_attr] //~ ERROR: custom attributes cannot be applied to statements
println!();
// Statement, semi
#[empty_attr] //~ ERROR: custom attributes cannot be applied to statements
S;
// Statement, local
#[empty_attr] //~ ERROR: custom attributes cannot be applied to statements
let _x = 2;
// Expr
let _x = #[identity_attr] 2; //~ ERROR: custom attributes cannot be applied to expressions
// Opt expr
let _x = [#[identity_attr] 2]; //~ ERROR: custom attributes cannot be applied to expressions
// Expr macro
let _x = #[identity_attr] println!();
//~^ ERROR: custom attributes cannot be applied to expressions
}
fn main() {
if let identity!(Some(_x)) = Some(3) {}
//~^ ERROR: procedural macros cannot be expanded to patterns
empty!(struct S;); //~ ERROR: procedural macros cannot be expanded to statements
empty!(let _x = 3;); //~ ERROR: procedural macros cannot be expanded to statements
let _x = identity!(3); //~ ERROR: procedural macros cannot be expanded to expressions
let _x = [empty!(3)]; //~ ERROR: procedural macros cannot be expanded to expressions
}
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