pub fn slot(ty: Type) -> Option<usize>Expand description
Which of the four widths a type is, or nothing for a width no rule is written at.
A pointer is one of them, at ADDRESS. A vector is none of them however wide its lane is,
because a rule at a width says nothing about how many lanes it acts on and lowering an add of
four lanes to an add of one would be wrong rather than incomplete.