c3c/test/test_suite/statements/foreach_custom_errors.c3

fn void test1()
{
    int x;
    foreach (a : x) { }; // #error: It's not possible to enumerate an expression of type 'int'
}

def Test1 = distinct int;

fn void test2()
{
    Test1 x;
    foreach (a : x) { }; // #error: It's not possible to enumerate an expression of type 'Test1'
}