[dependencies]
measureme = "10.0.0"
-rustc-rayon-core = "0.3.2"
+rustc-rayon-core = { version = "0.3.2", optional = true }
rustc_ast = { path = "../rustc_ast" }
rustc_data_structures = { path = "../rustc_data_structures" }
rustc_errors = { path = "../rustc_errors" }
rustc_serialize = { path = "../rustc_serialize" }
rustc_session = { path = "../rustc_session" }
rustc_span = { path = "../rustc_span" }
+
+[features]
+rustc_use_parallel_compiler = ["rustc-rayon-core", "rustc_query_system/rustc_use_parallel_compiler"]