Closed Bug 1254247 Opened 7 years ago Closed 7 years ago
_MUST _USE treats expressions evaluating to lvalue references as MUST _USE
Bug 1214037 didn't seem to fix this problem for making DrawResult a must use type. Here is one of many try pushes https://treeherder.mozilla.org/#/jobs?repo=try&revision=d89631512db0 The code DrawResult result = SUCCESS; result &= FunctionReturnDrawResult(); always seems to get flagged as not using the value (in many places). Trivially changing it to DrawResult result = SUCCESS; DrawResult resul2 = FunctionReturnDrawResult(); result = result & result2; makes the error go away. However this code still triggers the error DrawResult result = SUCCESS; result = result & FunctionReturnDrawResult();
Just chiming in: I too would really like to see this fixed. It let us prevent some important classes of errors that are definitely visible to our users as rendering issues.
Turns out that these expressions contained temporaries, which meant that the expression was wrapped. With this patch those wrappers are now ignored. Sorry for the delay, I'm in my last 3 weeks of class, and have remarkably little time to do this sort of stuff. try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=83f03890f8fd
Attachment #8729701 - Flags: review?(ehsan)
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