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Fix bug from small improvements

This commit is contained in:
Danila Fedorin 2019-10-10 17:59:44 -07:00
parent 463db16df7
commit 6dd52ac182
1 changed files with 5 additions and 4 deletions
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9
04/ast.cpp
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@ -97,10 +97,6 @@ type_ptr ast_case::typecheck(type_mgr& mgr, const type_env& env) const {
type_ptr case_type = mgr.resolve(of->typecheck(mgr, env), var);
type_ptr branch_type = mgr.new_type();
if(!dynamic_cast<type_base*>(case_type.get())) {
throw type_error("attempting case analysis of non-data type");
}
for(auto& branch : branches) {
type_env new_env = env.scope();
branch->pat->match(case_type, mgr, new_env);
@ -108,6 +104,11 @@ type_ptr ast_case::typecheck(type_mgr& mgr, const type_env& env) const {
mgr.unify(branch_type, curr_branch_type);
}
case_type = mgr.resolve(case_type, var);
if(!dynamic_cast<type_base*>(case_type.get())) {
throw type_error("attempting case analysis of non-data type");
}
return branch_type;
}