error: Document this module.

src/error.rs

@@ -4,6 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#![deny(missing_docs)]
+
 use std::convert::From;
 use std::num;
 use std::string;
@@ -14,14 +16,36 @@ use base64;
 use jid;
 use chrono;
 
+/// Contains one of the potential errors triggered while parsing an
+/// [Element](../struct.Element.html) into a specialised struct.
 #[derive(Debug)]
 pub enum Error {
+    /// The usual error when parsing something.
+    ///
+    /// TODO: use a structured error so the user can report it better, instead
+    /// of a freeform string.
     ParseError(&'static str),
+
+    /// Generated when some base64 content fails to decode, usually due to
+    /// extra characters.
     Base64Error(base64::DecodeError),
+
+    /// Generated when text which should be an integer fails to parse.
     ParseIntError(num::ParseIntError),
+
+    /// Generated when text which should be a string fails to parse.
     ParseStringError(string::ParseError),
+
+    /// Generated when text which should be an IP address (IPv4 or IPv6) fails
+    /// to parse.
     ParseAddrError(net::AddrParseError),
+
+    /// Generated when text which should be a [JID](../../jid/struct.Jid.html)
+    /// fails to parse.
     JidParseError(jid::JidParseError),
+
+    /// Generated when text which should be a
+    /// [DateTime](../date/struct.DateTime.html) fails to parse.
     ChronoParseError(chrono::ParseError),
 }