4 files changed, 37 insertions, 4 deletions
diff --git a/tests/ui/cfg/auxiliary/cfg_false_lib.rs b/tests/ui/cfg/auxiliary/cfg_false_lib.rs
index 3c011d72b..6c2dbb44d 100644
--- a/tests/ui/cfg/auxiliary/cfg_false_lib.rs
+++ b/tests/ui/cfg/auxiliary/cfg_false_lib.rs
@@ -1,6 +1,4 @@
-// It is unclear whether a fully unconfigured crate should link to standard library,
-// or what its `no_std`/`no_core`/`compiler_builtins` status, more precisely.
-// Currently the usual standard library prelude is added to such crates,
-// and therefore they link to libstd.
+// `#![no_std]` on a fully unconfigured crate is respected if it's placed before `cfg(FALSE)`.
+// This crate has no such attribute, therefore this crate does link to libstd.
 
 #![cfg(FALSE)]
diff --git a/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_after.rs b/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_after.rs
new file mode 100644
index 000000000..3cfa6c510
--- /dev/null
+++ b/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_after.rs
@@ -0,0 +1,5 @@
+// `#![no_std]` on a fully unconfigured crate is respected if it's placed before `cfg(FALSE)`.
+// Therefore this crate does link to libstd.
+
+#![cfg(FALSE)]
+#![no_std]
diff --git a/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_before.rs b/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_before.rs
new file mode 100644
index 000000000..8e89545b8
--- /dev/null
+++ b/tests/ui/cfg/auxiliary/cfg_false_lib_no_std_before.rs
@@ -0,0 +1,8 @@
+// `#![no_std]` on a fully unconfigured crate is respected if it's placed before `cfg(FALSE)`.
+// Therefore this crate doesn't link to libstd.
+
+// no-prefer-dynamic
+
+#![no_std]
+#![crate_type = "lib"]
+#![cfg(FALSE)]
diff --git a/tests/ui/cfg/auxiliary/cfged_out.rs b/tests/ui/cfg/auxiliary/cfged_out.rs
new file mode 100644
index 000000000..f6a9089cf
--- /dev/null
+++ b/tests/ui/cfg/auxiliary/cfged_out.rs
@@ -0,0 +1,22 @@
+pub mod inner {
+    #[cfg(FALSE)]
+    pub fn uwu() {}
+
+    #[cfg(FALSE)]
+    pub mod doesnt_exist {
+        pub fn hello() {}
+    }
+
+    pub mod wrong {
+        #[cfg(feature = "suggesting me fails the test!!")]
+        pub fn meow() {}
+    }
+
+    pub mod right {
+        #[cfg(feature = "what-a-cool-feature")]
+        pub fn meow() {}
+    }
+}
+
+#[cfg(i_dont_exist_and_you_can_do_nothing_about_it)]
+pub fn vanished() {}