mirror of https://github.com/rust-lang/rust
38 lines
1.0 KiB
Rust
38 lines
1.0 KiB
Rust
//@ check-pass
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//@ compile-flags: -Z span-debug
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//@ aux-build:test-macros.rs
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#![feature(cfg_eval)]
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#![feature(proc_macro_hygiene)]
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#![feature(stmt_expr_attributes)]
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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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#[macro_use]
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extern crate test_macros;
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#[cfg_eval]
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#[print_attr]
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struct S1 {
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#[cfg(FALSE)]
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field_false: u8,
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#[cfg(all(/*true*/))]
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#[cfg_attr(FALSE, unknown_attr)]
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#[cfg_attr(all(/*true*/), allow())]
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field_true: u8,
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}
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#[cfg_eval]
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#[cfg(FALSE)]
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struct S2 {}
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fn main() {
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// Subtle - we need a trailing comma after the '1' - otherwise, `#[cfg_eval]` will
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// turn this into `(#[cfg(all())] 1)`, which is a parenthesized expression, not a tuple
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// expression. `#[cfg]` is not supported inside parenthesized expressions, so this will
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// produce an error when attribute collection runs.
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let _ = #[cfg_eval] #[print_attr] #[cfg_attr(not(FALSE), rustc_dummy)]
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(#[cfg(FALSE)] 0, #[cfg(all(/*true*/))] 1,);
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}
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