Empty core_miri_test and alloc_miri_test unless cfg(any(test, doctest))

Author: hyd-dev

alloc_miri_test/Cargo.toml

@@ -10,6 +10,12 @@ edition = "2018"
 name = "alloc_miri_test"
 path = "../liballoc/src/lib.rs"
 
+[features]
+# Empty this crate to avoid two copies of liballoc.
+# See https://github.com/rust-lang/miri-test-libstd/issues/4.
+default = ["miri-test-libstd"]
+miri-test-libstd = []
+
 [dependencies]
 
 [dev-dependencies]

core_miri_test/Cargo.toml

@@ -12,6 +12,12 @@ path = "../libcore/src/lib.rs"
 test = false
 bench = false
 
+[features]
+# Empty this crate to avoid two copies of libcore.
+# See https://github.com/rust-lang/miri-test-libstd/issues/4.
+default = ["miri-test-libstd"]
+miri-test-libstd = []
+
 [[test]]
 name = "coretests"
 path = "../libcore/tests/lib.rs"