Merge rust-bitcoin/rust-bitcoin#3410: Fix buggy cfg in rustdocs
8bb0d3f667
Fix buggy cfg in rustdocs (Tobin C. Harding) Pull request description: Inb9643bf3e9
we introduced an incorrect `cfg` attribute, that has just shown up, no clue why clippy only just presented me with this error now. Anywho, the current code is buggy and the rustdoc tests are never being run. Fix `cfg` attribute to use the feature name correctly and fix the imports so the code runs. Maintain the explicit `main` so that we can return an error using the `?` operator. Remove the empty `main` because its not needed anymore, it is a hang-over from Rust back in the day (before main was automatically added, IIUC). ACKs for top commit: apoelstra: ACK8bb0d3f667
successfully ran local tests Tree-SHA512: 27f571ac3644417c06d0b4eb6fb122b39ac1068aefa4bcfc03f1febe2d031fb30616883c55c42c2ec80d419572fe7eba9bcc239e3c0e0e178ec7eaf8533b9efe
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commit
de120de5b9
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@ -11,7 +11,7 @@
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//!
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//! Hashing a single byte slice or a string:
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//!
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//! ```rust
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//! ```
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//! use bitcoin_hashes::Sha256;
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//!
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//! let bytes = [0u8; 5];
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@ -22,39 +22,32 @@
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//!
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//! Hashing content from a reader:
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//!
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//! ```rust
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//! #[cfg(std)]
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//! # fn main() -> std::io::Result<()> {
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//! ```
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//! #[cfg(feature = "std")] {
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//! use bitcoin_hashes::Sha256;
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//! let mut reader: &[u8] = b"hello"; // in real code, this could be a `File` or `TcpStream`
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//! let mut engine = Sha256::engine();
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//! std::io::copy(&mut reader, &mut engine)?;
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//! let hash = Sha256::from_engine(engine);
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//! # Ok(())
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//! std::io::copy(&mut reader, &mut engine).unwrap();
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//! let _hash = Sha256::from_engine(engine);
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//! # }
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//!
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//! #[cfg(not(std))]
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//! # fn main() {}
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//! ```
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//!
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//!
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//! Hashing content by [`std::io::Write`] on `HashEngine`:
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//!
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//! ```rust
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//! #[cfg(std)]
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//! # fn main() -> std::io::Result<()> {
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//! let mut part1: &[u8] = b"hello";
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//! let mut part2: &[u8] = b" ";
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//! let mut part3: &[u8] = b"world";
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//! ```
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//! #[cfg(feature = "std")] {
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//! use std::io::Write as _; // Or `bitcoin-io::Write` if `bitcoin-io` feature is enabled.
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//! use bitcoin_hashes::Sha256;
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//! let part1: &[u8] = b"hello";
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//! let part2: &[u8] = b" ";
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//! let part3: &[u8] = b"world";
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//! let mut engine = Sha256::engine();
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//! engine.write_all(part1)?;
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//! engine.write_all(part2)?;
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//! engine.write_all(part3)?;
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//! let hash = Sha256::from_engine(engine);
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//! # Ok(())
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//! engine.write_all(part1).expect("engine writes don't error");
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//! engine.write_all(part2).unwrap();
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//! engine.write_all(part3).unwrap();
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//! let _hash = Sha256::from_engine(engine);
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//! # }
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//!
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//! #[cfg(not(std))]
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//! # fn main() {}
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//! ```
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#![cfg_attr(not(feature = "std"), no_std)]
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