wrong code: code with undeclared variables compiles (cf b/14813)

[Timothee Cour via Digitalmars-d]

reposting https://issues.dlang.org/show_bug.cgi?id=14813 here as it seems
quite weird:

/+
dmd -c -o- main.d
how come this even compiles?
+/

main.d:
-----------
void fun()
{
    alias A = void delegate(int);
    //WTF?
    A temp1 = (some_inexistant_field) {  };
    //WTF?
    A temp2 = delegate(some_inexistant_field) {  };

    alias A2 = void delegate(int,double);
    //WTF?
    A2 temp3 = (some_inexistant_field,sadfasfd) {  };
}