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We will require expr within attribute input in the future in order to be able to handle some nightly features. Even, the current macro attribute input could be converted to an expression attribute input. gcc/rust/ChangeLog: * ast/rust-ast-collector.cc (TokenCollector::visit): Add visitor implementation. * ast/rust-ast-visitor.cc (DefaultASTVisitor::visit): Likewise. * ast/rust-ast-collector.h: Add function prototype. * ast/rust-ast-visitor.h: Likewise. * expand/rust-derive.h: Likewise. * hir/rust-ast-lower-base.h: Likewise. * ast/rust-ast.cc (Attribute::get_traits_to_derive): Handle EXPR variant. (AttrInputExpr::AttrInputExpr): Add constructor. (AttrInputExpr::operator=): Add assignment operator implementation. (AttrInputExpr::as_string): Add a string conversion member function. (AttrInputExpr::accept_vis): Add visitor function. * ast/rust-ast.h: Add EXPR type variant to AttrInput. * util/rust-attributes.cc (check_doc_attribute): Handle expr variant. * ast/rust-expr.h (class AttrInputExpr): Add class definition with member function prototypes. * hir/rust-ast-lower-base.cc (ASTLoweringBase::visit): Add empty visitor implementation. Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
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