P1847 Make declaration order layout mandated

[wg21bot]

P1847R0 Make declaration order layout mandated (Pal Balog)

[wg21bot]

P1847R1 Make declaration order layout mandated (Pal Balog)

[jfbastien]

This is much simpler than P1112 #38. I'd nonetheless like EWGI to explore it an polish the presentation first.

[theres-waldo]

EWG-I in Belfast

Forward to EWG
unanimous consent

Author will add discussion of which implementations have been surveyed to verify they don't make use of the reordering permission.

[wg21bot]

P1847R2 Make declaration order layout mandated (Pal Balog)