Rollup merge of #87081 - a1phyr:add_wasi_ext_tracking_issue, r=dtolnay

[rust.git] / src / test / ui / proc-macro / cfg-eval.rs

diff --git a/src/test/ui/proc-macro/cfg-eval.rs b/src/test/ui/proc-macro/cfg-eval.rs
index ea397df545265510905871f8812d0cb80fdd88b6..fa6d015e48eb8a4039f853b1fee08b23419006a0 100644 (file)
--- a/src/test/ui/proc-macro/cfg-eval.rs
+++ b/src/test/ui/proc-macro/cfg-eval.rs
@@ -5,7 +5,7 @@
 #![feature(cfg_eval)]
 #![feature(proc_macro_hygiene)]
 #![feature(stmt_expr_attributes)]
-
+#![feature(rustc_attrs)]
 #![no_std] // Don't load unnecessary hygiene information from std
 extern crate std;
 
@@ -28,5 +28,10 @@ struct S1 {
 struct S2 {}
 
 fn main() {
-    let _ = #[cfg_eval] #[print_attr](#[cfg(FALSE)] 0, #[cfg(all(/*true*/))] 1);
+    // Subtle - we need a trailing comma after the '1' - otherwise, `#[cfg_eval]` will
+    // turn this into `(#[cfg(all())] 1)`, which is a parenthesized expression, not a tuple
+    // expression. `#[cfg]` is not supported inside parenthesized expressions, so this will
+    // produce an error when attribute collection runs.
+    let _ = #[cfg_eval] #[print_attr] #[cfg_attr(not(FALSE), rustc_dummy)]
+    (#[cfg(FALSE)] 0, #[cfg(all(/*true*/))] 1,);
 }