better support for running libcore and liballoc tests with Miri

2021-07-18 17:21:59 +02:00
parent 18073052d8
commit 6cba79851a
2 changed files with 8 additions and 0 deletions
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -49,6 +49,10 @@
 //
 // This cfg won't affect doc tests.
 #![cfg(not(test))]
+// To run libcore tests without x.py without ending up with two copies of libcore, Miri needs to be
+// able to "empty" this crate. See <https://github.com/rust-lang/miri-test-libstd/issues/4>.
+// rustc itself never sets the feature, so this line has no affect there.
+#![cfg(any(not(feature = "miri-test-libstd"), test, doctest))]
 #![stable(feature = "core", since = "1.6.0")]
 #![doc(
    html_playground_url = "https://play.rust-lang.org/",