Error if there is no this in a call requiring this. Fixes: nocompile/b/bug_type_308_G,H nocompile/bug_e2ir_814 nocompile/i/inline_18_A,B nocompile/inline_07 nocompile/static_09

module bug41;

void main()
{
    char[] a = "hello world";
    char* ap = a.ptr;
    size_t i = 5;
    char[] b = ap[0..i];
    assert(b == "hello");
}