| // Copyright 2018 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // aux-build:attr-stmt-expr.rs |
| // ignore-stage1 |
| |
| #![feature(proc_macro, stmt_expr_attributes, proc_macro_stmt, proc_macro_expr)] |
| |
| extern crate attr_stmt_expr; |
| use attr_stmt_expr::{expect_let, expect_print_stmt, expect_expr, expect_print_expr, |
| no_output, noop}; |
| |
| fn print_str(string: &'static str) { |
| // macros are handled a bit differently |
| #[expect_print_expr] |
| println!("{}", string) |
| } |
| |
| fn main() { |
| #[expect_let] |
| let string = "Hello, world!"; |
| |
| #[expect_print_stmt] |
| println!("{}", string); |
| |
| let _: () = { |
| #[no_output] |
| "Hello, world!" |
| }; |
| |
| let _: &'static str = #[noop] "Hello, world!"; |
| |
| let _: &'static str = { |
| #[noop] "Hello, world!" |
| }; |
| |
| #[expect_expr] |
| print_str("string") |
| } |