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Properly handle null types in pattern typechecking.

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This commit is contained in:
Danila Fedorin 2020-06-14 00:43:39 -07:00
parent 33f8040886
commit 1e5d43e5e8
1 changed files with 3 additions and 2 deletions
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5
12/ast.cpp
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@ -355,10 +355,11 @@ void pattern_constr::find_variables(std::set<std::string>& into) const {
} }
void pattern_constr::typecheck(type_ptr t, type_mgr& mgr, type_env_ptr& env) const { void pattern_constr::typecheck(type_ptr t, type_mgr& mgr, type_env_ptr& env) const {
type_ptr constructor_type = env->lookup(constr)->instantiate(mgr); type_scheme_ptr constructor_type_scheme = env->lookup(constr);
if(!constructor_type) { if(!constructor_type_scheme) {
throw type_error(std::string("pattern using unknown constructor ") + constr); throw type_error(std::string("pattern using unknown constructor ") + constr);
} }
type_ptr constructor_type = constructor_type_scheme->instantiate(mgr);
for(auto& param : params) { for(auto& param : params) {
type_arr* arr = dynamic_cast<type_arr*>(constructor_type.get()); type_arr* arr = dynamic_cast<type_arr*>(constructor_type.get());