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Implement valtree

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valtree is a version of constants that is inherently safe to be used within types.
This is in contrast to ty::Const which can have different representations of the same value. These representation differences can show up in hashing or equality comparisons, breaking type equality of otherwise equal types.
valtrees do not have this problem.
This commit is contained in:
Oli Scherer
2021-02-22 14:09:24 +00:00
parent 0cc64a34e9
commit a4fbac163e
10 changed files with 132 additions and 6 deletions
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2
compiler/rustc_middle/src/ty/mod.rs
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@@ -55,7 +55,7 @@ pub use rustc_type_ir::*;
pub use self::binding::BindingMode;
pub use self::binding::BindingMode::*;
pub use self::consts::{Const, ConstInt, ConstKind, InferConst, ScalarInt};
pub use self::consts::{Const, ConstInt, ConstKind, InferConst, ScalarInt, ValTree};
pub use self::context::{
tls, CanonicalUserType, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations,
CtxtInterners, DelaySpanBugEmitted, FreeRegionInfo, GeneratorInteriorTypeCause, GlobalCtxt,