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  • Alec Theriault's avatar
    Error out of invalid Int/Word bit shifts · 5341edf3
    Alec Theriault authored and Ben Gamari's avatar Ben Gamari committed 
    Although the Haddock's for `shiftL` and `shiftR` do require the number
of bits to be non-negative, we should still check this before calling
out to primitives (which also have undefined behaviour for negative bit
shifts).

If a user _really_ wants to bypass checks that the number of bits is
sensible, they already have the aptly-named `unsafeShiftL`/`unsafeShiftR`
at their disposal.

See #16111.
    5341edf3
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