New upstream version 1.66.0+dfsg1

[rustc.git] / compiler / rustc_typeck / src / variance / mod.rs

diff --git a/compiler/rustc_typeck/src/variance/mod.rs b/compiler/rustc_typeck/src/variance/mod.rs
deleted file mode 100644 (file)
index 82103c5..0000000
--- a/compiler/rustc_typeck/src/variance/mod.rs
+++ /dev/null
@@ -1,63 +0,0 @@
-//! Module for inferring the variance of type and lifetime parameters. See the [rustc dev guide]
-//! chapter for more info.
-//!
-//! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/variance.html
-
-use rustc_arena::DroplessArena;
-use rustc_hir::def::DefKind;
-use rustc_hir::def_id::DefId;
-use rustc_middle::ty::query::Providers;
-use rustc_middle::ty::{self, CrateVariancesMap, TyCtxt};
-
-/// Defines the `TermsContext` basically houses an arena where we can
-/// allocate terms.
-mod terms;
-
-/// Code to gather up constraints.
-mod constraints;
-
-/// Code to solve constraints and write out the results.
-mod solve;
-
-/// Code to write unit tests of variance.
-pub mod test;
-
-/// Code for transforming variances.
-mod xform;
-
-pub fn provide(providers: &mut Providers) {
-    *providers = Providers { variances_of, crate_variances, ..*providers };
-}
-
-fn crate_variances(tcx: TyCtxt<'_>, (): ()) -> CrateVariancesMap<'_> {
-    let arena = DroplessArena::default();
-    let terms_cx = terms::determine_parameters_to_be_inferred(tcx, &arena);
-    let constraints_cx = constraints::add_constraints_from_crate(terms_cx);
-    solve::solve_constraints(constraints_cx)
-}
-
-fn variances_of(tcx: TyCtxt<'_>, item_def_id: DefId) -> &[ty::Variance] {
-    // Skip items with no generics - there's nothing to infer in them.
-    if tcx.generics_of(item_def_id).count() == 0 {
-        return &[];
-    }
-
-    match tcx.def_kind(item_def_id) {
-        DefKind::Fn
-        | DefKind::AssocFn
-        | DefKind::Enum
-        | DefKind::Struct
-        | DefKind::Union
-        | DefKind::Variant
-        | DefKind::Ctor(..) => {}
-        _ => {
-            // Variance not relevant.
-            span_bug!(tcx.def_span(item_def_id), "asked to compute variance for wrong kind of item")
-        }
-    }
-
-    // Everything else must be inferred.
-
-    let crate_map = tcx.crate_variances(());
-    crate_map.variances.get(&item_def_id).copied().unwrap_or(&[])
-}