rust/tests/ui/attributes/rustc-box.rs

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#![feature(rustc_attrs, stmt_expr_attributes)]
fn foo(_: u32, _: u32) {}
fn bar(_: u32) {}
fn main() {
#[rustc_box]
Box::new(1); // OK
#[rustc_box]
Box::pin(1); //~ ERROR `#[rustc_box]` attribute used incorrectly
#[rustc_box]
foo(1, 1); //~ ERROR `#[rustc_box]` attribute used incorrectly
#[rustc_box]
bar(1); //~ ERROR `#[rustc_box]` attribute used incorrectly
#[rustc_box] //~ ERROR `#[rustc_box]` attribute used incorrectly
#[rustfmt::skip]
Box::new(1);
}