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fix(frontends/lean/builtin_cmds): allow coercion command inside section, fixes #186

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This commit is contained in:
Leonardo de Moura 2014-09-12 12:13:29 -07:00
parent a305012ce5
commit a2e36e97f2
2 changed files with 13 additions and 10 deletions
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14
src/frontends/lean/builtin_cmds.cpp
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@ -295,19 +295,13 @@ environment open_cmd(parser & p) { return open_export_cmd(p, true); }
environment export_cmd(parser & p) { return open_export_cmd(p, false); }
environment coercion_cmd(parser & p) {
auto pos = p.pos();
expr f = p.parse_expr();
if (!is_constant(f))
throw parser_error("invalid 'coercion' command, constant expected", pos);
name f = p.check_constant_next("invalid 'coercion' command, constant expected");
if (p.curr_is_token(g_colon)) {
p.next();
pos = p.pos();
expr C = p.parse_expr();
if (!is_constant(C))
throw parser_error("invalid 'coercion' command, constant expected", pos);
return add_coercion(p.env(), const_name(f), const_name(C), p.ios());
name C = p.check_constant_next("invalid 'coercion' command, constant expected");
return add_coercion(p.env(), f, C, p.ios());
} else {
return add_coercion(p.env(), const_name(f), p.ios());
return add_coercion(p.env(), f, p.ios());
}
}

9
tests/lean/run/coesec.lean Normal file
View file

@ -0,0 +1,9 @@
inductive func (A B : Type) :=
mk : (A → B) → func A B
section
parameters {A B : Type}
definition to_function (F : func A B) : A → B :=
func.rec (λf, f) F
coercion to_function
end