bjoernager/rust
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Remove xform submodule.

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It used to be bigger, with an `Xform` trait, but now it has just a
single function.
This commit is contained in:
Nicholas Nethercote 2025-01-30 14:59:19 +11:00
parent 4e2ef694f3
commit 29317604d1
3 changed files with 19 additions and 26 deletions
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3
compiler/rustc_hir_analysis/src/variance/mod.rs
View file

@ -27,9 +27,6 @@ mod solve;
pub(crate) mod dump;
/// Code for transforming variances.
mod xform;
pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { variances_of, crate_variances, ..*providers };
}

20
compiler/rustc_hir_analysis/src/variance/solve.rs
View file

@ -12,8 +12,26 @@ use tracing::debug;
use super::constraints::*;
use super::terms::VarianceTerm::*;
use super::terms::*;
use super::xform::*;
fn glb(v1: ty::Variance, v2: ty::Variance) -> ty::Variance {
// Greatest lower bound of the variance lattice as defined in The Paper:
//
// *
// - +
// o
match (v1, v2) {
(ty::Invariant, _) | (_, ty::Invariant) => ty::Invariant,
(ty::Covariant, ty::Contravariant) => ty::Invariant,
(ty::Contravariant, ty::Covariant) => ty::Invariant,
(ty::Covariant, ty::Covariant) => ty::Covariant,
(ty::Contravariant, ty::Contravariant) => ty::Contravariant,
(x, ty::Bivariant) | (ty::Bivariant, x) => x,
}
}
struct SolveContext<'a, 'tcx> {
terms_cx: TermsContext<'a, 'tcx>,
constraints: Vec<Constraint<'a>>,

22
compiler/rustc_hir_analysis/src/variance/xform.rs
View file

@ -1,22 +0,0 @@
use rustc_middle::ty;
pub(crate) fn glb(v1: ty::Variance, v2: ty::Variance) -> ty::Variance {
// Greatest lower bound of the variance lattice as
// defined in The Paper:
//
// *
// - +
// o
match (v1, v2) {
(ty::Invariant, _) | (_, ty::Invariant) => ty::Invariant,
(ty::Covariant, ty::Contravariant) => ty::Invariant,
(ty::Contravariant, ty::Covariant) => ty::Invariant,
(ty::Covariant, ty::Covariant) => ty::Covariant,
(ty::Contravariant, ty::Contravariant) => ty::Contravariant,
(x, ty::Bivariant) | (ty::Bivariant, x) => x,
}
}