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Rollup merge of #125635 - fmease:mv-type-binding-assoc-item-constraint, r=compiler-errors

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Rename HIR `TypeBinding` to `AssocItemConstraint` and related cleanup

Rename `hir::TypeBinding` and `ast::AssocConstraint` to `AssocItemConstraint` and update all items and locals using the old terminology.

Motivation: The terminology *type binding* is extremely outdated. "Type bindings" not only include constraints on associated *types* but also on associated *constants* (feature `associated_const_equality`) and on RPITITs of associated *functions* (feature `return_type_notation`). Hence the word *item* in the new name. Furthermore, the word *binding* commonly refers to a mapping from a binder/identifier to a "value" for some definition of "value". Its use in "type binding" made sense when equality constraints (e.g., `AssocTy = Ty`) were the only kind of associated item constraint. Nowadays however, we also have *associated type bounds* (e.g., `AssocTy: Bound`) for which the term *binding* doesn't make sense.

---

Old terminology (HIR, rustdoc):

```
`TypeBinding`: (associated) type binding
├── `Constraint`: associated type bound
└── `Equality`: (associated) equality constraint (?)
    ├── `Ty`: (associated) type binding
    └── `Const`: associated const equality (constraint)
```

Old terminology (AST, abbrev.):

```
`AssocConstraint`
├── `Bound`
└── `Equality`
    ├── `Ty`
    └── `Const`
```

New terminology (AST, HIR, rustdoc):

```
`AssocItemConstraint`: associated item constraint
├── `Bound`: associated type bound
└── `Equality`: associated item equality constraint OR associated item binding (for short)
    ├── `Ty`: associated type equality constraint OR associated type binding (for short)
    └── `Const`: associated const equality constraint OR associated const binding (for short)
```

r? compiler-errors
This commit is contained in:
Matthias Krüger 2024-05-31 08:50:22 +02:00 • committed by GitHub
commit 379233242b
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108 changed files with 878 additions and 818 deletions
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16
compiler/rustc_ast_passes/src/ast_validation.rs
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@ -671,7 +671,7 @@ impl<'a> AstValidator<'a> {
let constraint_sugg = data.args.iter().filter_map(|a| match a {
AngleBracketedArg::Arg(_) => None,
AngleBracketedArg::Constraint(c) => {
Some(pprust::to_string(|s| s.print_assoc_constraint(c)))
Some(pprust::to_string(|s| s.print_assoc_item_constraint(c)))
}
});
format!(
@ -1199,11 +1199,11 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
for arg in &data.args {
match arg {
AngleBracketedArg::Arg(arg) => self.visit_generic_arg(arg),
// Type bindings such as `Item = impl Debug` in `Iterator<Item = Debug>`
// are allowed to contain nested `impl Trait`.
// Associated type bindings such as `Item = impl Debug` in
// `Iterator<Item = Debug>` are allowed to contain nested `impl Trait`.
AngleBracketedArg::Constraint(constraint) => {
self.with_impl_trait(None, |this| {
this.visit_assoc_constraint(constraint);
this.visit_assoc_item_constraint(constraint);
});
}
}
@ -1363,7 +1363,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
}
}
}
// The lowered form of parenthesized generic args contains a type binding.
// The lowered form of parenthesized generic args contains an associated type binding.
Some(ast::GenericArgs::Parenthesized(args)) => {
self.dcx().emit_err(errors::NegativeBoundWithParentheticalNotation {
span: args.span,
@ -1589,11 +1589,13 @@ fn deny_equality_constraints(
let len = assoc_path.segments.len() - 1;
let gen_args = args.as_deref().cloned();
// Build `<Bar = RhsTy>`.
let arg = AngleBracketedArg::Constraint(AssocConstraint {
let arg = AngleBracketedArg::Constraint(AssocItemConstraint {
id: rustc_ast::node_id::DUMMY_NODE_ID,
ident: *ident,
gen_args,
kind: AssocConstraintKind::Equality { term: predicate.rhs_ty.clone().into() },
kind: AssocItemConstraintKind::Equality {
term: predicate.rhs_ty.clone().into(),
},
span: ident.span,
});
// Add `<Bar = RhsTy>` to `Foo`.