Is the compiler supposed to accept this?

[Brian Schott]

There are severel comments in the part of the dmd front end that 
show the syntax that the parser is looking for. Here's a listing:

// function type (parameters) { statements... }
// delegate type (parameters) { statements... }
// function (parameters) { statements... }
// delegate (parameters) { statements... }
// function { statements... }
// delegate { statements... }
// (parameters) { statements... }
// { statements... }
// identifier => expression

Based on the fact that "function (parameters) => expression" 
isn't written out like the others, I'm going to file an 
accepts-valid bug for this.