either = "1.5.0"
gsgdt = "0.1.2"
tracing = "0.1"
-rustc-rayon = "0.3.2"
-rustc-rayon-core = "0.3.2"
+rustc-rayon = { version = "0.3.2", optional = true }
+rustc-rayon-core = { version = "0.3.2", optional = true }
polonius-engine = "0.13.0"
rustc_apfloat = { path = "../rustc_apfloat" }
rustc_attr = { path = "../rustc_attr" }
rustc_type_ir = { path = "../rustc_type_ir" }
rand = "0.8.4"
rand_xoshiro = "0.6.0"
+
+[features]
+rustc_use_parallel_compiler = ["rustc-rayon", "rustc-rayon-core"]