# Const bounds in generic parameters and where clauses

const fn f<T: [const] A + const B>() where T: ~const C {}

==>

SourceFile(
  FunctionItem(
    const,
    fn,
    BoundIdentifier,
    TypeParamList(
      ConstrainedTypeParameter(
        TypeIdentifier,
        TraitBounds(
          ConstTraitBound(const, TypeIdentifier),
          ConstTraitBound(const, TypeIdentifier)))),
    ParamList,
    WhereClause(
      where,
      TypeBoundClause(TypeIdentifier, TraitBounds(ConstTraitBound(const, TypeIdentifier)))),
    Block))

# Parenthesized const bounds

const fn f<T: ([const] A) + (~const B)>() {}

==>

SourceFile(
  FunctionItem(
    const,
    fn,
    BoundIdentifier,
    TypeParamList(
      ConstrainedTypeParameter(
        TypeIdentifier,
        TraitBounds(
          ParenthesizedTraitBound(ConstTraitBound(const, TypeIdentifier)),
          ParenthesizedTraitBound(ConstTraitBound(const, TypeIdentifier))))),
    ParamList,
    Block))

# Const bounds in impl Trait

fn f(_: impl const A + const B) {}

==>

SourceFile(
  FunctionItem(
    fn,
    BoundIdentifier,
    ParamList(
      Parameter(
        _,
        BoundedType(
          AbstractType(impl, ConstTraitBound(const, TypeIdentifier)),
          ConstTraitBound(const, TypeIdentifier)))),
    Block))