diff --git a/library/core/Cargo.toml b/library/core/Cargo.toml
index b7c6db6c78dde..4d69f0d83deca 100644
--- a/library/core/Cargo.toml
+++ b/library/core/Cargo.toml
@@ -31,6 +31,7 @@ check-cfg = [
     'cfg(no_fp_fmt_parse)',
     'cfg(stdarch_intel_sde)',
     'cfg(target_arch, values("xtensa"))',
+    'cfg(test)',
     # core use #[path] imports to portable-simd `core_simd` crate
     # and to stdarch `core_arch` crate which messes-up with Cargo list
     # of declared features, we therefor expect any feature cfg
diff --git a/src/tools/cargo b/src/tools/cargo
index cecde95c119a4..776129a2b9392 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit cecde95c119a456c30e57d3e4b31fff5a7d83df4
+Subproject commit 776129a2b93928a67ec4c2f8e5bc3cfeb5bc06cd