const STD_MODULE_SOURCE: &str = "import std::string;\n\nextern module io {\n fn log(value: String) -> Unit;\n fn int_to_string(value: i64) -> String;\n fn bool_to_string(value: Bool) -> String;\n}\n\nextern module string {\n fn concat(left: String, right: String) -> String;\n fn starts_with(value: String, prefix: String) -> Bool;\n fn drop(value: String, count: i64) -> String;\n fn take(value: String, count: i64) -> String;\n}\n";