Make "`aa[key]`" use the same runtime call as "`key in aa`". The runtime calls these were using were different, but with equivalent definitions. With `ldc -O3`, the following functions now all compile to the exact same code: {{{ int[int] y; void foo(int x) { if (x in y) { auto z = x in y; sink(*z); } } void bar(int x) { if (x in y) { sink(y[x]); } } void baz(int x) { if (auto p = x in y) { sink(*p); } } }}}

enum fields 
{ 
    FIELD1, 
    FIELD2 
} 
 
fields find_field(fields f) { 
    with(fields) { 
        switch(f) { 
        case FIELD1:  
	  return FIELD1;
        default: 
	  return FIELD2;
        } 
    } 
} 
 
void main() { 
  assert(find_field(fields.FIELD1) == fields.FIELD1);
  assert(find_field(fields.FIELD2) == fields.FIELD2);
}