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fix(kernel/converter): missing case: two constants c.{l1} and c.{l2} where l1 and l2 are structurally different but equivalent (or can be made equivalent)

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-06-25 16:05:41 -07:00
parent 49a6048060
commit 1d4352aeb4
1 changed files with 26 additions and 10 deletions
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36
src/kernel/converter.cpp
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@ -279,6 +279,26 @@ struct default_converter : public converter {
instantiate_rev(s, subst.size(), subst.data()), c, jst);
}
bool is_def_eq(level const & l1, level const & l2, type_checker & c, delayed_justification & jst) {
if (is_equivalent(l1, l2)) {
return true;
} else if (has_meta(l1) || has_meta(l2)) {
add_cnstr(c, mk_level_eq_cnstr(l1, l2, jst.get()));
return true;
} else {
return false;
}
}
bool is_def_eq(levels const & ls1, levels const & ls2, type_checker & c, delayed_justification & jst) {
if (is_nil(ls1) && is_nil(ls2))
return true;
else if (!is_nil(ls1) && !is_nil(ls2))
return is_def_eq(head(ls1), head(ls2), c, jst) && is_def_eq(tail(ls1), tail(ls2), c, jst);
else
return false;
}
/** \brief This is an auxiliary method for is_def_eq. It handles the "easy cases". */
lbool quick_is_def_eq(expr const & t, expr const & s, type_checker & c, delayed_justification & jst) {
if (t == s)
@ -293,15 +313,7 @@ struct default_converter : public converter {
case expr_kind::Lambda: case expr_kind::Pi:
return to_lbool(is_def_eq_binding(t, s, c, jst));
case expr_kind::Sort:
// t and s are Sorts
if (is_equivalent(sort_level(t), sort_level(s))) {
return l_true;
} else if (has_meta(sort_level(t)) || has_meta(sort_level(s))) {
add_cnstr(c, mk_level_eq_cnstr(sort_level(t), sort_level(s), jst.get()));
return l_true;
} else {
return l_false;
}
return to_lbool(is_def_eq(sort_level(t), sort_level(s), c, jst));
case expr_kind::Meta:
lean_unreachable(); // LCOV_EXCL_LINE
case expr_kind::Var: case expr_kind::Local: case expr_kind::App:
@ -399,6 +411,10 @@ struct default_converter : public converter {
if (r != l_undef) return r == l_true;
}
if (is_constant(t_n) && is_constant(s_n) && const_name(t_n) == const_name(s_n) &&
is_def_eq(const_levels(t_n), const_levels(s_n), c, jst))
return true;
// At this point, t_n and s_n are in weak head normal form (modulo meta-variables and proof irrelevance)
if (is_app(t_n) && is_app(s_n)) {
type_checker::scope scope(c);
@ -406,7 +422,7 @@ struct default_converter : public converter {
buffer<expr> s_args;
expr t_fn = get_app_args(t_n, t_args);
expr s_fn = get_app_args(s_n, s_args);
if (t_fn == s_fn && t_args.size() == s_args.size()) {
if (is_def_eq(t_fn, s_fn, c, jst) && t_args.size() == s_args.size()) {
unsigned i = 0;
for (; i < t_args.size(); i++) {
if (!is_def_eq(t_args[i], s_args[i], c, jst))