What does the C standard say about bitshifting more bits than the width of type?

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From my WG12/N1124 draft (not the standard, but Good Enough For Me), there’s the following block in 6.5.7 Bitwise shift operators:

If the value of the right operand is negative or is
greater than or equal to the width of the promoted left operand, the behavior is undefined.

So, undefined. Be careful.

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