rust/compiler/rustc_const_eval
bors 8876ca3dd4 Auto merge of #94597 - nnethercote:ConstAllocation, r=fee1-dead
Introduce `ConstAllocation`.

Currently some `Allocation`s are interned, some are not, and it's very
hard to tell at a use point which is which.

This commit introduces `ConstAllocation` for the known-interned ones,
which makes the division much clearer. `ConstAllocation::inner()` is
used to get the underlying `Allocation`.

In some places it's natural to use an `Allocation`, in some it's natural
to use a `ConstAllocation`, and in some places there's no clear choice.
I've tried to make things look as nice as possible, while generally
favouring `ConstAllocation`, which is the type that embodies more
information. This does require quite a few calls to `inner()`.

The commit also tweaks how `PartialOrd` works for `Interned`. The
previous code was too clever by half, building on `T: Ord` to make the
code shorter. That caused problems with deriving `PartialOrd` and `Ord`
for `ConstAllocation`, so I changed it to build on `T: PartialOrd`,
which is slightly more verbose but much more standard and avoided the
problems.

r? `@fee1-dead`
2022-03-06 22:37:54 +00:00
..
src Auto merge of #94597 - nnethercote:ConstAllocation, r=fee1-dead 2022-03-06 22:37:54 +00:00
Cargo.toml Remove unused dependencies from rustc_const_eval 2021-10-14 15:42:42 -05:00