Merge pull request swiftlang#34771 from atrick/disable-linear-lifetime-assert

Author: swift-ci

lib/SIL/Verifier/LinearLifetimeChecker.cpp

@@ -551,9 +551,17 @@ LinearLifetimeChecker::Error LinearLifetimeChecker::checkValueImpl(
     Optional<function_ref<void(SILBasicBlock *)>> leakingBlockCallback,
     Optional<function_ref<void(Operand *)>>
         nonConsumingUseOutsideLifetimeCallback) {
-  assert((!consumingUses.empty()
-          || deadEndBlocks.isDeadEnd(value->getParentBlock())) &&
-         "Must have at least one consuming user?!");
+  // FIXME: rdar://71240363. This assert does not make sense because
+  // consumingUses in some cases only contains the destroying uses. Owned values
+  // may not be destroyed because they may be converted to
+  // ValueOwnershipKind::None on all paths reaching a return. Instead, this
+  // utility needs to find liveness first considering all uses (or at least all
+  // uses that may be on a lifetime boundary). We probably then won't need this
+  // assert, but I'm leaving the FIXME as a placeholder for that work.
+  //
+  // assert((!consumingUses.empty()
+  //        || deadEndBlocks.isDeadEnd(value->getParentBlock())) &&
+  //       "Must have at least one consuming user?!");
 
   State state(value, visitedBlocks, errorBuilder, leakingBlockCallback,
               nonConsumingUseOutsideLifetimeCallback, consumingUses,