Alias example should supposedly be illegal, but runs fine

[Michael]

Hello,

I have been looking at the following example found right at the 
end of the section here: 
https://dlang.org/spec/declaration.html#alias

struct S { static int i; }
S s;

alias a = s.i; // illegal, s.i is an expression
alias b = S.i; // ok
b = 4;         // sets S.i to 4

and it runs fine to me, including if I add:

a = 3;

So, to me I don't see why either can't be valid, but either way 
something needs to be fixed to reflect that this is no longer 
illegal in DMD v2.077.1.