Just yesterday I had upgraded the version of clang used to compile Android's emulator. It got reverted due to some post submit test failing suddenly. The test c

Just yesterday I had upgraded the version of clang used to compile Android's emulator. It got reverted due to some post submit test failing suddenly. The test case was shifting values in a byte array into one value but the LHS of a left shift didn't have enough bits to represent the shift, which is explicit UB. The statement had multiple shift operations (and other sub expressions with templated types) so it wasn't immediately clear that was the issue. -fsanitize=undefined found it immediately. "Spot the UB" is seemingly becoming my pastime.