message: Require the std feature of num-complex.
diff: @@ -19,7 +19,7 @@ failure_derive = "0.1.3"
  [dev-dependencies]
  itertools-num = "0.1"
  -num-complex = { version = "0.2", default-features = false }
  +num-complex = { version = "0.2", default-features = false, features = ["std"] }
  rand = "0.4" # 0.4 is required to maintain compatibility with Rust 1.23
  [badges]
  