Enum Missing 

pub enum Missing {
    OnStack,
    OnX87,
    InBothFiles,
    Width,
}

Why a parameter could not be brought in.

Variants

OnStack

It arrives on the stack, which is somewhere nothing reads from yet: the offset is a distance into a frame, and a frame is not worked out until after allocation.

OnX87

It travels on the x87 stack, which is a long double and nothing else. That stack is a third register file, it is not one the allocator has, and no instruction in the description touches it.

InBothFiles

It is a float passed to a callee that takes arguments beyond the ones its signature names, on a convention that puts such a float in a vector register and in the general purpose register at the same position at once. Which arguments are the ones beyond the signature is what decides whether the second copy is needed, and a call does not carry that yet.

Width

It is a width no pseudo covers, which is anything a machine register does not hold.

Implementations

impl Missing

pub fn why(self) -> &'static str

What it says when a function could not be compiled because of it.

Worded so that it reads the same about a value arriving and a value being passed, since the two are the same fact seen from the two ends of one call.

Trait Implementations

impl Clone for Missing

fn clone(&self) -> Missing

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Missing

impl Debug for Missing

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Missing

impl PartialEq for Missing

fn eq(&self, other: &Missing) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Missing