left_shift() adapts the example from @davidgiven that caused `ack -O3` to crash. multiply() is a similar example. Edit the build system to use -O3 for this test. It now takes -O3 from the test's filename, and still defaults to -O0.  | 
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| plat | ||
				left_shift() adapts the example from @davidgiven that caused `ack -O3` to crash. multiply() is a similar example. Edit the build system to use -O3 for this test. It now takes -O3 from the test's filename, and still defaults to -O0.  | 
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|---|---|---|
| .. | ||
| plat | ||