Clean up EcKey example a bit

Author: sfackler

openssl/src/ec.rs

@@ -295,7 +295,7 @@ impl EcKey {
     ///
     /// # Example
     ///
-    /// ```
+    /// ```no_run
     /// use openssl::bn::BigNumContext;
     /// use openssl::ec::*;
     /// use openssl::nid;
@@ -304,13 +304,11 @@ impl EcKey {
     /// // get bytes from somewhere, i.e. this will not produce a valid key
     /// let public_key: Vec<u8> = vec![];
     ///
-    /// // create a PKey from the binary form of a EcPoint
-    /// EcGroup::from_curve_name(nid::SECP256K1)
-    ///         .and_then(|group| BigNumContext::new().map(|ctx| (group, ctx)))
-    ///         .and_then(|(group, mut ctx)| EcPoint::from_bytes(&group, &public_key, &mut ctx)
-    ///                                              .map(|point| (group, point) ))
-    ///         .and_then(|(group, point)| EcKey::from_public_key(&group, &point))
-    ///         .and_then(|ec_key| PKey::from_ec_key(ec_key));
+    /// // create an EcKey from the binary form of a EcPoint
+    /// let group = EcGroup::from_curve_name(nid::SECP256K1).unwrap();
+    /// let mut ctx = BigNumContext::new().unwrap();
+    /// let point = EcPoint::from_bytes(&group, &public_key, &mut ctx).unwrap();
+    /// let key = EcKey::from_public_key(&group, &point);
     /// ```
     pub fn from_public_key(group: &EcGroupRef, public_key: &EcPointRef) -> Result<EcKey, ErrorStack> {
         unsafe {