2 files changed, 19 insertions, 0 deletions
diff --git a/src/tools/cargo/tests/testsuite/mock-std/library/alloc/Cargo.toml b/src/tools/cargo/tests/testsuite/mock-std/library/alloc/Cargo.toml
new file mode 100644
index 000000000..dc965abff
--- /dev/null
+++ b/src/tools/cargo/tests/testsuite/mock-std/library/alloc/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "alloc"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+
+[dependencies]
+registry-dep-using-core = { version = "*", features = ['mockbuild'] }
diff --git a/src/tools/cargo/tests/testsuite/mock-std/library/alloc/src/lib.rs b/src/tools/cargo/tests/testsuite/mock-std/library/alloc/src/lib.rs
new file mode 100644
index 000000000..823716e40
--- /dev/null
+++ b/src/tools/cargo/tests/testsuite/mock-std/library/alloc/src/lib.rs
@@ -0,0 +1,11 @@
+#![feature(staged_api)]
+#![stable(since = "1.0.0", feature = "dummy")]
+
+extern crate alloc;
+
+#[stable(since = "1.0.0", feature = "dummy")]
+pub use alloc::*;
+
+#[stable(since = "1.0.0", feature = "dummy")]
+pub fn custom_api() {
+}