Merge #382: Remove extern crates

b44acef Re-export serde using without extern crate (Tobin C. Harding)
15817dd docs: Remove extern crate (Tobin C. Harding)
aacece4 examples: Remove crate imports (Tobin C. Harding)

Pull request description:

  Now we have edition 2018 we can remove the usage of `extern crate`.

  - Patch 1 does the `examples/`
  - Patch 2 does the docs
  - Patch 3 does the main crate

ACKs for top commit:
  apoelstra:
    ACK b44acef
  sanket1729:
    ACK b44acef

Tree-SHA512: f66280d1484aaac7607ee71537eef173d37545da39adf0e5de759bb5dee7d856aeaeb079bd312768360e21cca85945fadb42383353709082175f49961c06a6ba

Author: sanket1729

examples/htlc.rs

@@ -14,9 +14,6 @@
 
 //! Example: Create an HTLC with miniscript using the policy compiler
 
-extern crate bitcoin;
-extern crate miniscript;
-
 use bitcoin::Network;
 use miniscript::descriptor::Wsh;
 use miniscript::policy::{Concrete, Liftable};

examples/parse.rs

@@ -14,9 +14,6 @@
 
 //! Example: Parsing a descriptor from a string.
 
-use bitcoin;
-use miniscript;
-
 use miniscript::{descriptor::DescriptorType, Descriptor, DescriptorTrait};
 use std::str::FromStr;
 

examples/psbt.rs

@@ -1,5 +1,3 @@
-use bitcoin;
-
 use bitcoin::consensus::encode::deserialize;
 use bitcoin::hashes::hex::FromHex;
 use miniscript::psbt::PsbtExt;

examples/sign_multisig.rs

@@ -14,9 +14,6 @@
 
 //! Example: Signing a 2-of-3 multisignature.
 
-use bitcoin;
-use miniscript;
-
 use bitcoin::blockdata::witness::Witness;
 use bitcoin::secp256k1;
 use miniscript::DescriptorTrait;

examples/verify_tx.rs

@@ -14,9 +14,6 @@
 
 //! Example: Verifying a signed transaction.
 
-use bitcoin;
-use miniscript;
-
 use bitcoin::consensus::Decodable;
 use bitcoin::secp256k1::{self, Secp256k1};
 use bitcoin::util::sighash;

src/lib.rs

@@ -53,9 +53,6 @@
 //! ## Deriving an address from a descriptor
 //!
 //! ```rust
-//! extern crate bitcoin;
-//! extern crate miniscript;
-//!
 //! use std::str::FromStr;
 //! use miniscript::{DescriptorTrait};
 //!
@@ -100,7 +97,7 @@
 
 pub use bitcoin;
 #[cfg(feature = "serde")]
-pub extern crate serde;
+pub use serde;
 #[cfg(all(test, feature = "unstable"))]
 extern crate test;
 

src/miniscript/mod.rs

@@ -173,9 +173,6 @@ impl<Ctx: ScriptContext> Miniscript<Ctx::Key, Ctx> {
     /// ## Decode/Parse a miniscript from script hex
     ///
     /// ```rust
-    /// extern crate bitcoin;
-    /// extern crate miniscript;
-    ///
     /// use miniscript::Miniscript;
     /// use miniscript::{Segwitv0, Tap};
     /// use miniscript::bitcoin::secp256k1::XOnlyPublicKey;