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safe transmute: use Assume struct to provide analysis options

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This was left as a TODO in #92268, and brings the trait more in
line with what was defined in MCP411.

`Assume::visibility` has been renamed to `Assume::safety`, as
library safety is what's actually being assumed; visibility is
just the mechanism by which it is currently checked (this may
change).

ref: https://github.com/rust-lang/compiler-team/issues/411
ref: https://github.com/rust-lang/rust/issues/99571
This commit is contained in:
Jack Wrenn 2022-08-18 19:39:14 +00:00
parent e0dc8d7801
commit f46fffc276
77 changed files with 1321 additions and 721 deletions
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3
compiler/rustc_hir/src/lang_items.rs
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@ -192,7 +192,8 @@ language_item_table! {
DispatchFromDyn, sym::dispatch_from_dyn, dispatch_from_dyn_trait, Target::Trait, GenericRequirement::Minimum(1);
// language items relating to transmutability
TransmuteTrait, sym::transmute_trait, transmute_trait, Target::Trait, GenericRequirement::Exact(6);
TransmuteOpts, sym::transmute_opts, transmute_opts, Target::Struct, GenericRequirement::Exact(0);
TransmuteTrait, sym::transmute_trait, transmute_trait, Target::Trait, GenericRequirement::Exact(3);
Add(Op), sym::add, add_trait, Target::Trait, GenericRequirement::Exact(1);
Sub(Op), sym::sub, sub_trait, Target::Trait, GenericRequirement::Exact(1);