Use rustc-hex without default features

uint/Cargo.toml

@@ -10,15 +10,16 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 byteorder = { version = "1", default-features = false }
 heapsize = { version = "0.4.2", optional = true }
-rustc-hex = "2.0"
+rustc-hex = { version = "2.0", default-features = false }
 quickcheck = { version = "0.6", optional = true }
 
 [dev-dependencies]
 crunchy = "0.1.5"
 quickcheck = "0.6"
+rustc-hex = "2.0"
 
 [features]
-std = ["byteorder/std"]
+std = ["byteorder/std", "rustc-hex/std"]
 heapsizeof = ["heapsize"]
 impl_quickcheck_arbitrary = ["quickcheck"]
 

uint/src/lib.rs

@@ -30,7 +30,6 @@ pub extern crate rustc_hex;
 pub extern crate quickcheck;
 
 #[cfg(all(not(feature = "std"), test))]
-#[macro_use]
 extern crate alloc;
 
 mod uint;

uint/tests/uint_tests.rs

@@ -8,8 +8,8 @@ extern crate crunchy;
 #[macro_use]
 extern crate quickcheck;
 
-use std::u64::MAX;
-use std::str::FromStr;
+use core::u64::MAX;
+use core::str::FromStr;
 use uint::FromDecStrErr;
 
 construct_uint!(U128, 2);