set_scope_value(gc, &scope, z, STRING(gc, "foo"));
ASSERT_TRUE(equal(CONS(gc, x, STRING(gc, "hello")), get_scope_value(&scope, x)),
set_scope_value(gc, &scope, z, STRING(gc, "foo"));
ASSERT_TRUE(equal(CONS(gc, x, STRING(gc, "hello")), get_scope_value(&scope, x)),