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feat(kernel/replace_visitor): relax replace_visitor contract, the input expression can be null

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-12-07 15:35:26 -08:00
parent e2999d3ff6
commit b6b520302d
1 changed files with 3 additions and 1 deletions
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4
src/kernel/replace_visitor.cpp
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@ -52,7 +52,7 @@ expr replace_visitor::visit_pi(expr const & e, context const & ctx) {
expr replace_visitor::visit_let(expr const & e, context const & ctx) {
lean_assert(is_let(e));
return update_let(e, [&](expr const & t, expr const & v, expr const & b) {
expr new_t = t ? visit(t, ctx) : expr();
expr new_t = visit(t, ctx);
expr new_v = visit(v, ctx);
expr new_b;
{
@ -64,6 +64,8 @@ expr replace_visitor::visit_let(expr const & e, context const & ctx) {
}
expr replace_visitor::visit(expr const & e, context const & ctx) {
check_system("expression replacer");
if (!e)
return e;
bool shared = false;
if (is_shared(e)) {
shared = true;