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fix(frontends/lean/elaborator): bug in translation function

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This commit fixes the bug reported in the lean discussion list:
https://groups.google.com/forum/#!topic/lean-discuss/oyzgIqdMyNc
This commit is contained in:
Leonardo de Moura 2015-05-02 18:05:07 -07:00
parent e1dc18f6b6
commit 118189eaac
2 changed files with 15 additions and 8 deletions
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17
src/frontends/lean/elaborator.cpp
View file

@ -1890,12 +1890,19 @@ std::tuple<expr, expr, level_param_names> elaborator::operator()(
}
// Auxiliary procedure for #translate
static expr translate_local_name(list<expr> const & ctx, name const & local_name,
static expr translate_local_name(environment const & env,
list<expr> const & ctx, name const & local_name,
expr const & src) {
for (expr const & local : ctx) {
if (local_pp_name(local) == local_name)
return copy(local);
}
if (env.find(local_name)) {
if (is_local(src))
return mk_constant(local_name);
else
return src;
}
throw_elaborator_exception(sstream() << "unknown identifier '" << local_name << "'", src);
}
@ -1908,14 +1915,10 @@ static expr translate(environment const & env, list<expr> const & ctx, expr cons
if (is_placeholder(e) || is_by(e)) {
return some_expr(e); // ignore placeholders
} else if (is_constant(e)) {
if (!env.find(const_name(e))) {
expr new_e = copy_tag(e, translate_local_name(ctx, const_name(e), e));
expr new_e = copy_tag(e, translate_local_name(env, ctx, const_name(e), e));
return some_expr(new_e);
} else {
return none_expr();
}
} else if (is_local(e)) {
expr new_e = copy_tag(e, translate_local_name(ctx, local_pp_name(e), e));
expr new_e = copy_tag(e, translate_local_name(env, ctx, local_pp_name(e), e));
return some_expr(new_e);
} else {
return none_expr();

4
tests/lean/run/scope_bug.lean Normal file
View file

@ -0,0 +1,4 @@
definition s : Type := sorry
example (A : Type) (s : A) : A := by exact s
example (A : Type) : A → A := by intro s; exact s