No completion for if condition made of variable declaration

[ghost]

class Foo
{
    int i;
}

void main()
{
    Object o;
    if (Foo foo = cast(Foo) o)
    {
        foo.|
    }
}

or just

void main()
{
    if (int i = 1)
    {
        i.|
    }
}

It's because it's not a standard declaration so maybe the DSymbol visitor needs a special case for this (or at least fixes)

[ghost]

This can be fixed in dparse by parsing a VariableDeclaration instead of the special tule, with a few tweaks (allow no semicolon after decl). It's also maybe necessary to push a scope in dsymbol.