Fix TryStmt constructors

codon/parser/peg/grammar.peg

@@ -298,7 +298,7 @@ try_stmt <-
   }
   / ('try' _ ':' _ suite) (SAMEDENT 'finally' _ ':' _ suite)? {
     return asts(Try, LOC,
-      ac_stmt(V0), vector<ExceptStmt*>{},
+      ac_stmt(V0), vector<ExceptStmt*>{}, nullptr,
       VS.size() > 1 ? ac_stmt(V1) : nullptr
     );
   }

codon/parser/visitors/typecheck/error.cpp

@@ -121,7 +121,8 @@ void TypecheckVisitor::visit(TryStmt *stmt) {
       // Handle all other exceptions
       c->exc = transformType(c->getException());
 
-      auto t = extractClassType(c->exc);
+      if (c->getException()) {
+        auto t = extractClassType(c->getException());
         bool exceptionOK = false;
         for (auto &p : getSuperTypes(t))
           if (p->is("std.internal.types.error.BaseException.0")) {
@@ -129,9 +130,10 @@ void TypecheckVisitor::visit(TryStmt *stmt) {
             break;
           }
         if (!exceptionOK)
-        E(Error::CATCH_EXCEPTION_TYPE, c->exc, t->toString());
+          E(Error::CATCH_EXCEPTION_TYPE, c->getException(), t->toString());
         if (val)
           unify(val->getType(), extractType(c->getException()));
+      }
       ctx->blockLevel++;
       c->suite = SuiteStmt::wrap(transform(c->getSuite()));
       ctx->blockLevel--;
@@ -221,6 +223,7 @@ void TypecheckVisitor::visit(WithStmt *stmt) {
         as, N<ExprStmt>(N<CallExpr>(N<DotExpr>(N<IdExpr>(var), "__enter__"))),
         N<TryStmt>(!content.empty() ? N<SuiteStmt>(content) : clone(stmt->getSuite()),
                    std::vector<ExceptStmt *>{},
+                   nullptr,
                    N<SuiteStmt>(N<ExprStmt>(
                        N<CallExpr>(N<DotExpr>(N<IdExpr>(var), "__exit__")))))};
   }

test/parser/typecheck/test_access.codon

@@ -576,5 +576,5 @@ class Foo:
     def goo(self):
         print(self.__name__)
 Foo().goo()
-#! error: 'Foo' object has no attribute '__name__'
-#! during the realization
+#! 'Foo' object has no attribute '__name__'
+#! during the realization of goo