by kq1quick:

The language specification currently states:

Tokens 

      Tokens form the vocabulary of the Go language. There are four 
classes: identifiers, keywords, operators and  delimiters, and 
literals. White space, formed from spaces (U+0020), horizontal tabs (U 
+0009), carriage returns (U+000D), and newlines (U+000A), is ignored 
except as it separates tokens that would otherwise combine into a 
single token. While breaking the input into tokens, the next token is 
the longest sequence of characters that form a valid token.


The second sentence is wrong: it states that there are "four" classes and 
then proceeds to enumerate 5.

The third sentence is no longer true with the Dec 22 release.  At a 
minimum, the assertion above that carriage returns are whitespace must be 
removed because they now no longer server to separate tokens and are 
ignored otherwise: they significantly affect the parse.  See issues 453 
and 454 and http://groups.google.com/group/golang-nuts/t/9eb0c7c1f20db921 
(particularly my post).  More explicitly, it should discuss the fact that 
newlines are sometimes just whitespace and sometimes parse elements and 
that there are special rules throughout the latter portions of the 
language specification detailing when they are not just whitespace.

To this end, newlines may form the 6th class of tokens.