Rollup merge of rust-lang#140249 - BoxyUwU:remove_weak_alias_terminology, r=oli-obk

Remove `weak` alias terminology

I find the "weak" alias terminology to be quite confusing. It implies the existence of "strong" aliases (which do not exist) and I'm not really sure what about weak aliases is "weak". I much prefer "free alias" as the term. I think it's much more obvious what it means as "free function" is a well defined term that already exists in rust.

It's also a little confusing given "weak alias" is already a term in linker/codegen spaces which are part of the compiler too. Though I'm not particularly worried about that as it's usually very obvious if you're talking about the type system or not lol. I'm also currently trying to write documentation about aliases and it's somewhat awkward/confusing to be talking about *weak* aliases, when I'm not really sure what the basis for that as the term actually *is*.

I would also be happy to just find out there's a nice meaning behind calling them "weak" aliases :-)

r? `@oli-obk`

maybe we want a types MCP to decide on a specific naming here? or maybe we think its just too late to go back on this naming decision ^^'

Author: GuillaumeGomez

compiler/rustc_const_eval/src/util/type_name.rs

@@ -56,7 +56,7 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
             | ty::Coroutine(def_id, args) => self.print_def_path(def_id, args),
             ty::Foreign(def_id) => self.print_def_path(def_id, &[]),
 
-            ty::Alias(ty::Weak, _) => bug!("type_name: unexpected weak projection"),
+            ty::Alias(ty::Free, _) => bug!("type_name: unexpected free alias"),
             ty::Alias(ty::Inherent, _) => bug!("type_name: unexpected inherent projection"),
             ty::CoroutineWitness(..) => bug!("type_name: unexpected `CoroutineWitness`"),
         }

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -2019,7 +2019,7 @@ fn check_variances_for_type_defn<'tcx>(
         ItemKind::TyAlias(..) => {
             assert!(
                 tcx.type_alias_is_lazy(item.owner_id),
-                "should not be computing variance of non-weak type alias"
+                "should not be computing variance of non-free type alias"
             );
         }
         kind => span_bug!(item.span, "cannot compute the variances of {kind:?}"),
@@ -2251,7 +2251,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for IsProbablyCyclical<'tcx> {
     fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<(), ()> {
         let def_id = match ty.kind() {
             ty::Adt(adt_def, _) => Some(adt_def.did()),
-            ty::Alias(ty::Weak, alias_ty) => Some(alias_ty.def_id),
+            ty::Alias(ty::Free, alias_ty) => Some(alias_ty.def_id),
             _ => None,
         };
         if let Some(def_id) = def_id {

compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs

@@ -150,7 +150,7 @@ impl<'tcx> InherentCollect<'tcx> {
         let id = id.owner_id.def_id;
         let item_span = self.tcx.def_span(id);
         let self_ty = self.tcx.type_of(id).instantiate_identity();
-        let mut self_ty = self.tcx.peel_off_weak_alias_tys(self_ty);
+        let mut self_ty = self.tcx.peel_off_free_alias_tys(self_ty);
         // We allow impls on pattern types exactly when we allow impls on the base type.
         // FIXME(pattern_types): Figure out the exact coherence rules we want here.
         while let ty::Pat(base, _) = *self_ty.kind() {
@@ -188,7 +188,7 @@ impl<'tcx> InherentCollect<'tcx> {
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
-            | ty::Alias(ty::Weak, _)
+            | ty::Alias(ty::Free, _)
             | ty::Bound(..)
             | ty::Placeholder(_)
             | ty::Infer(_) => {

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -189,7 +189,7 @@ pub(crate) fn orphan_check_impl(
                     ty::Projection => "associated type",
                     // type Foo = (impl Sized, bool)
                     // impl AutoTrait for Foo {}
-                    ty::Weak => "type alias",
+                    ty::Free => "type alias",
                     // type Opaque = impl Trait;
                     // impl AutoTrait for Opaque {}
                     ty::Opaque => "opaque type",

compiler/rustc_hir_analysis/src/constrained_generic_params.rs

@@ -49,7 +49,7 @@ pub(crate) fn parameters_for<'tcx>(
     include_nonconstraining: bool,
 ) -> Vec<Parameter> {
     let mut collector = ParameterCollector { parameters: vec![], include_nonconstraining };
-    let value = if !include_nonconstraining { tcx.expand_weak_alias_tys(value) } else { value };
+    let value = if !include_nonconstraining { tcx.expand_free_alias_tys(value) } else { value };
     value.visit_with(&mut collector);
     collector.parameters
 }
@@ -68,9 +68,9 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ParameterCollector {
             {
                 return;
             }
-            // All weak alias types should've been expanded beforehand.
-            ty::Alias(ty::Weak, _) if !self.include_nonconstraining => {
-                bug!("unexpected weak alias type")
+            // All free alias types should've been expanded beforehand.
+            ty::Alias(ty::Free, _) if !self.include_nonconstraining => {
+                bug!("unexpected free alias type")
             }
             ty::Param(param) => self.parameters.push(Parameter::from(param)),
             _ => {}

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -958,7 +958,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             // feature `lazy_type_alias` enabled get encoded as a type alias that normalization will
             // then actually instantiate the where bounds of.
             let alias_ty = ty::AliasTy::new_from_args(tcx, did, args);
-            Ty::new_alias(tcx, ty::Weak, alias_ty)
+            Ty::new_alias(tcx, ty::Free, alias_ty)
         } else {
             tcx.at(span).type_of(did).instantiate(tcx, args)
         }

compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs

@@ -157,10 +157,10 @@ fn insert_required_predicates_to_be_wf<'tcx>(
                 );
             }
 
-            ty::Alias(ty::Weak, alias) => {
+            ty::Alias(ty::Free, alias) => {
                 // This corresponds to a type like `Type<'a, T>`.
                 // We check inferred and explicit predicates.
-                debug!("Weak");
+                debug!("Free");
                 check_inferred_predicates(
                     tcx,
                     alias.def_id,

compiler/rustc_hir_analysis/src/variance/constraints.rs

@@ -107,7 +107,7 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
         let current_item = &CurrentItem { inferred_start };
         let ty = tcx.type_of(def_id).instantiate_identity();
 
-        // The type as returned by `type_of` is the underlying type and generally not a weak projection.
+        // The type as returned by `type_of` is the underlying type and generally not a free alias.
         // Therefore we need to check the `DefKind` first.
         if let DefKind::TyAlias = tcx.def_kind(def_id)
             && tcx.type_alias_is_lazy(def_id)
@@ -282,7 +282,7 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
                 self.add_constraints_from_invariant_args(current, data.args, variance);
             }
 
-            ty::Alias(ty::Weak, ref data) => {
+            ty::Alias(ty::Free, ref data) => {
                 self.add_constraints_from_args(current, data.def_id, data.args, variance);
             }
 

compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs

@@ -337,7 +337,7 @@ impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
         match ty.kind() {
             ty::Adt(adt_def, _) => Some(*adt_def),
             // FIXME(#104767): Should we handle bound regions here?
-            ty::Alias(ty::Projection | ty::Inherent | ty::Weak, _)
+            ty::Alias(ty::Projection | ty::Inherent | ty::Free, _)
                 if !ty.has_escaping_bound_vars() =>
             {
                 if self.next_trait_solver() {
@@ -357,7 +357,7 @@ impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
             // WF obligations that are registered elsewhere, but they have a
             // better cause code assigned to them in `add_required_obligations_for_hir`.
             // This means that they should shadow obligations with worse spans.
-            if let ty::Alias(ty::Projection | ty::Weak, ty::AliasTy { args, def_id, .. }) =
+            if let ty::Alias(ty::Projection | ty::Free, ty::AliasTy { args, def_id, .. }) =
                 ty.kind()
             {
                 self.add_required_obligations_for_hir(span, *def_id, args, hir_id);

compiler/rustc_infer/src/infer/relate/generalize.rs

@@ -113,7 +113,7 @@ impl<'tcx> InferCtxt<'tcx> {
                         }]);
                     }
                     // The old solver only accepts projection predicates for associated types.
-                    ty::Alias(ty::Inherent | ty::Weak | ty::Opaque, _) => {
+                    ty::Alias(ty::Inherent | ty::Free | ty::Opaque, _) => {
                         return Err(TypeError::CyclicTy(source_ty));
                     }
                     _ => bug!("generalized `{source_ty:?} to infer, not an alias"),