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fix(frontends/lean): infer type of definitions

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-06-25 08:39:14 -07:00
parent d055c4880f
commit 3e7dfa6212
2 changed files with 17 additions and 9 deletions
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24
src/frontends/lean/decl_cmds.cpp
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@ -10,6 +10,7 @@ Author: Leonardo de Moura
#include "library/scoped_ext.h"
#include "library/aliases.h"
#include "library/private.h"
#include "library/placeholder.h"
#include "library/locals.h"
#include "library/explicit.h"
#include "frontends/lean/parser.h"
@ -216,7 +217,20 @@ environment definition_cmd_core(parser & p, bool is_theorem, bool is_opaque) {
{
parser::local_scope scope1(p);
parse_univ_params(p, ls_buffer);
if (!p.curr_is_token(g_colon)) {
if (p.curr_is_token(g_assign)) {
auto pos = p.pos();
p.next();
type = p.save_pos(mk_expr_placeholder(), pos);
value = p.parse_expr();
} else if (p.curr_is_token(g_colon)) {
p.next();
{
parser::param_universe_scope scope2(p);
type = p.parse_expr();
}
p.check_token_next(g_assign, "invalid declaration, ':=' expected");
value = p.parse_expr();
} else {
buffer<parameter> ps;
optional<local_environment> lenv;
{
@ -229,14 +243,6 @@ environment definition_cmd_core(parser & p, bool is_theorem, bool is_opaque) {
value = p.parse_scoped_expr(ps, *lenv);
type = p.pi_abstract(ps, type);
value = p.lambda_abstract(ps, value);
} else {
p.next();
{
parser::param_universe_scope scope2(p);
type = p.parse_expr();
}
p.check_token_next(g_assign, "invalid declaration, ':=' expected");
value = p.parse_expr();
}
update_univ_parameters(ls_buffer, collect_univ_params(value, collect_univ_params(type)), p);
ls = to_list(ls_buffer.begin(), ls_buffer.end());

2
tests/lean/run/e2.lean Normal file
View file

@ -0,0 +1,2 @@
definition Bool [inline] := Type.{0}
check Bool