[compiler] repro for type inference + control flow bug #31570
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Repro for bug in our type inference system. We currently propagate inferred types through control flow / potential type guards. Note that this is inconsistent with both [Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SRWxgABAAxYjsgC87OAAB0oOzReythU2Mh2YKQNyILLeMKxeymrgZNLhCIbsL6QBuYVs7DsgBCVD5AuVYolUClMpAZsoiqtorVGvZWpuSqg9OFMAeyjg0HZdTmW3lAAp5NKAPJoABWcwkAEppWZGLg4O12fJ2bSuTyhSKxSwJEJKCKAOQ2tiVvMi3MAMkbOasNb5vP5svlsoNPuFfoD8JFGQqUel8vZAB9TVReCHoHa0MRnlBUwWIJbi6K4DB2RHbGxk1uVSrd-uAIShsDh4hR5PHoun5-siS1SgQADuHuw34AotQECUBGsqysmfYvuyvrbqepblg2EFitBKpwRWOZ9vSuQgA0JgkEGUBJBk9gmCA9JAA) and [Typescript](https://www.typescriptlang.org/play/?#code/C4TwDgpgBAYg9nKBeKBvAUFLUDWBLAOwBMAuKAInjnIBpNsA3AQwBsBXCMgtgWwCMIAJ3QBfANzpQkKACEmg5GnpZ8xMuTmDayqM3aco3fkLoj0AMzYEAxsDxwCUawAsI1nFQAUADzJw+AFZuwACUZEwAzhFCwBFQ3lB4cVRK2InmUJ4AhJ4A5KpEuYmOCQBkpfEAdAXISCiUCOQhIalp2MDOgnAA7oYQvQCigl2CnuRWEN6QthBETTpmZhZWtvaOPEyEPmQpAD6y8jRODqRQfAgsEEwEYbAIrVh4GZ7WJy0Ybdgubh4IPiEST5YQQQYBsQQlQHYMxpEFgiHxCQiIA)
kassens
approved these changes
Nov 18, 2024
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Repro for bug in our type inference system.
We currently propagate inferred types through control flow / potential type guards. Note that this is inconsistent with both Flow and Typescript