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// aux-build:proc-macro-gates.rs
// gate-test-proc_macro_hygiene
#![feature(stmt_expr_attributes)]
extern crate proc_macro_gates as foo;
use foo::*;
fn _test_inner() {
#![a] //~ ERROR: non-builtin inner attributes are unstable
}
#[a] //~ ERROR: custom attributes cannot be applied to modules
mod _test2 {}
mod _test2_inner {
#![a] //~ ERROR: custom attributes cannot be applied to modules
//~| ERROR: non-builtin inner attributes are unstable
}
#[a = "y"] //~ ERROR: must only be followed by a delimiter token
fn _test3() {}
fn attrs() {
// Statement, item
#[a] // OK
struct S;
// Statement, macro
#[a] //~ ERROR: custom attributes cannot be applied to statements
println!();
// Statement, semi
#[a] //~ ERROR: custom attributes cannot be applied to statements
S;
// Statement, local
#[a] //~ ERROR: custom attributes cannot be applied to statements
let _x = 2;
// Expr
let _x = #[a] 2; //~ ERROR: custom attributes cannot be applied to expressions
// Opt expr
let _x = [#[a] 2]; //~ ERROR: custom attributes cannot be applied to expressions
// Expr macro
let _x = #[a] println!(); //~ ERROR: custom attributes cannot be applied to expressions
}
fn main() {
let _x: m!(u32) = 3; //~ ERROR: procedural macros cannot be expanded to types
if let m!(Some(_x)) = Some(3) {} //~ ERROR: procedural macros cannot be expanded to patterns
m!(struct S;); //~ ERROR: procedural macros cannot be expanded to statements
m!(let _x = 3;); //~ ERROR: procedural macros cannot be expanded to statements
let _x = m!(3); //~ ERROR: procedural macros cannot be expanded to expressions
let _x = [m!(3)]; //~ ERROR: procedural macros cannot be expanded to expressions
}
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