mirror of https://github.com/rust-lang/rust
67 lines
1.6 KiB
Rust
67 lines
1.6 KiB
Rust
//@ aux-build:attr-stmt-expr.rs
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//@ aux-build:test-macros.rs
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//@ compile-flags: -Z span-debug
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#![feature(proc_macro_hygiene)]
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#![feature(rustc_attrs)]
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#![no_std] // Don't load unnecessary hygiene information from std
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extern crate std;
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extern crate test_macros;
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extern crate attr_stmt_expr;
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use test_macros::print_attr;
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use attr_stmt_expr::{expect_let, expect_my_macro_stmt, expect_expr, expect_my_macro_expr};
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// We don't use `std::println` so that we avoid loading hygiene
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// information from libstd, which would affect the SyntaxContext ids
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macro_rules! my_macro {
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($($tt:tt)*) => { () }
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}
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fn print_str(string: &'static str) {
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// macros are handled a bit differently
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#[expect_my_macro_expr]
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//~^ ERROR attributes on expressions are experimental
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//~| HELP add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
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my_macro!("{}", string)
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}
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macro_rules! make_stmt {
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($stmt:stmt) => {
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#[print_attr]
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#[rustc_dummy]
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$stmt
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}
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}
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macro_rules! second_make_stmt {
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($stmt:stmt) => {
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make_stmt!($stmt);
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}
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}
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fn main() {
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make_stmt!(struct Foo {});
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#[print_attr]
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#[expect_let]
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let string = "Hello, world!";
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#[print_attr]
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#[expect_my_macro_stmt]
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my_macro!("{}", string);
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#[print_attr]
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second_make_stmt!(#[allow(dead_code)] struct Bar {});
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#[print_attr]
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#[rustc_dummy]
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struct Other {}
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#[expect_expr]
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//~^ ERROR attributes on expressions are experimental
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//~| HELP add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
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print_str("string")
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}
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