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I suppose that -XOverlappingInstances could mean "silently honour OVERLAPPABLE/OVERLAPPING pragmas", while lacking it would mean "honour OVERLAPPABLE/OVERLAPPING pragmas, but emit noisy warnings" or even "don't honour them and warn".
But that is different to the behaviour today, so we'd need a new LANGUAGE pragma. Perhaps -XHonourOverlappingInstances or something.
This would be a reasonable alternative to the keyword-based solution. At least for now. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAEBCAAGBQJT45F5AAoJENEcKRHOUZzewwwQALUiK60sbIC6j5nbXHPCeau8 bN80pmhUL11lAyI7OCSQyV8S9AU7ikgaUPyKwk/cx/TtKQGLwghWFZlRCoCRrplk dmGsSCw2LN4GElHL22EcyELPcx74lknz3tmQuZg4oAUXm1h2w8774L3iHOE4Ompg 9gYzuOo8Ii3oHJ6fjIL0DwGWp92F8NrTPeQmziBOPHAgQYVFO8QMncXcOGtdIZUb PQr0szr9HLkcwKSrYoxvvZBqEj6AM0xj+KhX87NEnQ08EaY6FO/Dhm4mi7X/A5Ca khwsjwId0qR6C4vs7QyYnaK3yiUFlZMUlXdUhpRG3wWFHseb3m9tX2a2ewE30jPl TgnoU5NYphijMWXpc3p06D5Zj0lT6L++Y3Ez8CS+0QpBPG9c0CJnLqXFQ5CNbl+9 Ryzpg7ltg5vhtq7BLwcz+V87lzc4KYm/tyqEVvxN59W6XLuLLe4tW6NL9vLDl9Rg /3vMRYKZBa+0we7jAi/wYbdks7g+9sqpiLqke5m73a5F2j/TTl4BrkIj2vG0KrP+ G9eJC1aieUbfPXXwXWSJh8binJNp//qWs7rILDsx4r0o1QR245uT5WzwkwapXmE8 ZYuXsVcc1/mS1ZneOP6zn0QOlRcUJ0A5dFxQg69hsXpD+MM226r/57P3eI9XhLRN W+DNBoXbr9mp8eNGjl6O =CFkA -----END PGP SIGNATURE-----