diff --git a/openssl/src/envelope.rs b/openssl/src/envelope.rs
index 86ba637740cd41076f4b371db9b2a0e499482853..963bab34dcb4238f239ff7568629930ca20d2f3a 100644
--- a/openssl/src/envelope.rs
+++ b/openssl/src/envelope.rs
@@ -8,20 +8,18 @@
 //! use openssl::pkey::PKey;
 //! use openssl::symm::Cipher;
 //!
-//! fn main() {
-//!     let rsa = Rsa::generate(2048).unwrap();
-//!     let key = PKey::from_rsa(rsa).unwrap();
+//! let rsa = Rsa::generate(2048).unwrap();
+//! let key = PKey::from_rsa(rsa).unwrap();
 //!
-//!     let cipher = Cipher::aes_256_cbc();
-//!     let mut seal = Seal::new(cipher, &[key]).unwrap();
+//! let cipher = Cipher::aes_256_cbc();
+//! let mut seal = Seal::new(cipher, &[key]).unwrap();
 //!
-//!     let secret = b"My secret message";
-//!     let mut encrypted = vec![0; secret.len() + cipher.block_size()];
+//! let secret = b"My secret message";
+//! let mut encrypted = vec![0; secret.len() + cipher.block_size()];
 //!
-//!     let mut enc_len = seal.update(secret, &mut encrypted).unwrap();
-//!     enc_len += seal.finalize(&mut encrypted[enc_len..]).unwrap();
-//!     encrypted.truncate(enc_len);
-//! }
+//! let mut enc_len = seal.update(secret, &mut encrypted).unwrap();
+//! enc_len += seal.finalize(&mut encrypted[enc_len..]).unwrap();
+//! encrypted.truncate(enc_len);
 //! ```
 use crate::error::ErrorStack;
 use crate::pkey::{HasPrivate, HasPublic, PKey, PKeyRef};
diff --git a/openssl/src/pkey.rs b/openssl/src/pkey.rs
index 6688062c966ecf5caa2d90742ca80b9e171c8b3d..d7bcdf0efef1761c099427e65347fd5f18ca0ade 100644
--- a/openssl/src/pkey.rs
+++ b/openssl/src/pkey.rs
@@ -33,13 +33,11 @@
 //! use openssl::pkey::PKey;
 //! use std::str;
 //!
-//! fn main() {
-//!     let rsa = Rsa::generate(2048).unwrap();
-//!     let pkey = PKey::from_rsa(rsa).unwrap();
+//! let rsa = Rsa::generate(2048).unwrap();
+//! let pkey = PKey::from_rsa(rsa).unwrap();
 //!
-//!     let pub_key: Vec<u8> = pkey.public_key_to_pem().unwrap();
-//!     println!("{:?}", str::from_utf8(pub_key.as_slice()).unwrap());
-//! }
+//! let pub_key: Vec<u8> = pkey.public_key_to_pem().unwrap();
+//! println!("{:?}", str::from_utf8(pub_key.as_slice()).unwrap());
 //! ```
 
 use foreign_types::{ForeignType, ForeignTypeRef};
diff --git a/openssl/src/rsa.rs b/openssl/src/rsa.rs
index 9cd0fb14270ea276cd92170289dceea97f4f6261..21e647cc23a7c5e2b8656a79c31b710c5477496f 100644
--- a/openssl/src/rsa.rs
+++ b/openssl/src/rsa.rs
@@ -18,12 +18,10 @@
 //! ```rust
 //! use openssl::rsa::{Rsa, Padding};
 //!
-//! fn main() {
-//!     let rsa = Rsa::generate(2048).unwrap();
-//!     let data = b"foobar";
-//!     let mut buf = vec![0; rsa.size() as usize];
-//!     let encrypted_len = rsa.public_encrypt(data, &mut buf, Padding::PKCS1).unwrap();
-//! }
+//! let rsa = Rsa::generate(2048).unwrap();
+//! let data = b"foobar";
+//! let mut buf = vec![0; rsa.size() as usize];
+//! let encrypted_len = rsa.public_encrypt(data, &mut buf, Padding::PKCS1).unwrap();
 //! ```
 use foreign_types::{ForeignType, ForeignTypeRef};
 use libc::c_int;
diff --git a/openssl/src/sha.rs b/openssl/src/sha.rs
index e74eb29fd0320d90da1c37e943b0cf2c89f4d9ed..811a5321d338c9ec7844d1235d46473204c3518f 100644
--- a/openssl/src/sha.rs
+++ b/openssl/src/sha.rs
@@ -16,15 +16,13 @@
 //! ```rust
 //! use openssl::sha;
 //!
-//! fn main() {
-//!     let mut hasher = sha::Sha256::new();
+//! let mut hasher = sha::Sha256::new();
 //!
-//!     hasher.update(b"Hello, ");
-//!     hasher.update(b"world");
+//! hasher.update(b"Hello, ");
+//! hasher.update(b"world");
 //!
-//!     let hash = hasher.finish();
-//!     println!("Hashed \"Hello, world\" to {}", hex::encode(hash));
-//! }
+//! let hash = hasher.finish();
+//! println!("Hashed \"Hello, world\" to {}", hex::encode(hash));
 //! ```
 //!
 //! On the other hand, if you already have access to all of the data you woud like to hash, you
@@ -34,10 +32,8 @@
 //! ```rust
 //! use openssl::sha::sha256;
 //!
-//! fn main() {
-//!     let hash = sha256(b"your data or message");
-//!     println!("Hash = {}", hex::encode(hash));
-//! }
+//! let hash = sha256(b"your data or message");
+//! println!("Hash = {}", hex::encode(hash));
 //! ```
 use libc::c_void;
 use std::mem;
diff --git a/openssl/src/x509/extension.rs b/openssl/src/x509/extension.rs
index 1386066740c5ea807e1b3f845829abf3cd258074..fca3492a92aa05a20558c54d81fdcc5aaf66352f 100644
--- a/openssl/src/x509/extension.rs
+++ b/openssl/src/x509/extension.rs
@@ -11,12 +11,10 @@
 //! use openssl::x509::extension::BasicConstraints;
 //! use openssl::x509::X509Extension;
 //!
-//! fn main() {
-//!     let mut bc = BasicConstraints::new();
-//!     let bc = bc.critical().ca().pathlen(1);
+//! let mut bc = BasicConstraints::new();
+//! let bc = bc.critical().ca().pathlen(1);
 //!
-//!     let extension: X509Extension = bc.build().unwrap();
-//! }
+//! let extension: X509Extension = bc.build().unwrap();
 //! ```
 use std::fmt::Write;
 
diff --git a/openssl/src/x509/store.rs b/openssl/src/x509/store.rs
index 50d911be6ba9262959a36ad739366d349e22fd34..88ca354627b2e05f6d0cc7aa5a6cce3eb39ae01e 100644
--- a/openssl/src/x509/store.rs
+++ b/openssl/src/x509/store.rs
@@ -13,28 +13,26 @@
 //! use openssl::rsa::Rsa;
 //! use openssl::nid::Nid;
 //!
-//! fn main() {
-//!     let rsa = Rsa::generate(2048).unwrap();
-//!     let pkey = PKey::from_rsa(rsa).unwrap();
+//! let rsa = Rsa::generate(2048).unwrap();
+//! let pkey = PKey::from_rsa(rsa).unwrap();
 //!
-//!     let mut name = X509Name::builder().unwrap();
-//!     name.append_entry_by_nid(Nid::COMMONNAME, "foobar.com").unwrap();
-//!     let name = name.build();
+//! let mut name = X509Name::builder().unwrap();
+//! name.append_entry_by_nid(Nid::COMMONNAME, "foobar.com").unwrap();
+//! let name = name.build();
 //!
-//!     let mut builder = X509::builder().unwrap();
-//!     builder.set_version(2).unwrap();
-//!     builder.set_subject_name(&name).unwrap();
-//!     builder.set_issuer_name(&name).unwrap();
-//!     builder.set_pubkey(&pkey).unwrap();
-//!     builder.sign(&pkey, MessageDigest::sha256()).unwrap();
+//! let mut builder = X509::builder().unwrap();
+//! builder.set_version(2).unwrap();
+//! builder.set_subject_name(&name).unwrap();
+//! builder.set_issuer_name(&name).unwrap();
+//! builder.set_pubkey(&pkey).unwrap();
+//! builder.sign(&pkey, MessageDigest::sha256()).unwrap();
 //!
-//!     let certificate: X509 = builder.build();
+//! let certificate: X509 = builder.build();
 //!
-//!     let mut builder = X509StoreBuilder::new().unwrap();
-//!     let _ = builder.add_cert(certificate);
+//! let mut builder = X509StoreBuilder::new().unwrap();
+//! let _ = builder.add_cert(certificate);
 //!
-//!     let store: X509Store = builder.build();
-//! }
+//! let store: X509Store = builder.build();
 //! ```
 
 use foreign_types::ForeignTypeRef;