swift

7f871043 - [TypeChecker] Diagnose empty `switch` statements in function builder bodies

[TypeChecker] Diagnose empty `switch` statements in function builder bodies If there are no 'case' statements in the body let's try to diagnose this situation via limited exhaustiveness check before failing a builder transform, otherwise type-checker might end up without any diagnostics which leads to crashes in SILGen. Resolves: rdar://problem/65983237 (cherry picked from commit 0cac079d0074ea261124d0ed7fd9916742cd9ea8)