void visit(expr const & e) {
switch (e.kind()) {
case expr_kind::Sort: return;
case expr_kind::Macro: visit_macro(e); return;
case expr_kind::Constant: visit_constant(e); return;
case expr_kind::Var: lean_unreachable();
case expr_kind::Meta: lean_unreachable();
case expr_kind::Local: return;
case expr_kind::App: visit_app(e); return;
case expr_kind::Lambda: visit_binding(e); return;
case expr_kind::Pi: visit_binding(e); return;
case expr_kind::Let: visit_let(e); return;
}
}
expr visit(expr const & e) {
switch (e.kind()) {
case expr_kind::Sort: case expr_kind::Constant:
case expr_kind::Var: case expr_kind::Meta:
case expr_kind::Local:
return e;
default:
break;
}
check_system("unfold macros");
auto it = m_cache.find(e);
if (it != m_cache.end())
return it->second;
switch (e.kind()) {
case expr_kind::Sort: case expr_kind::Constant:
case expr_kind::Var: case expr_kind::Meta:
case expr_kind::Local:
lean_unreachable();
case expr_kind::Macro:
return save_result(e, visit_macro(e));
case expr_kind::App:
return save_result(e, visit_app(e));
case expr_kind::Lambda: case expr_kind::Pi:
return save_result(e, visit_binding(e));
}
lean_unreachable();
}
expr replace_visitor::visit_pi(expr const & e) { return visit_binding(e); }