import Std::Io::{PrintLine};
import Std::Test::{Test_AssertEqString, Test_Pass};

func Main() -> int {
    let name: String = "Bux";
    let n: int = 42;
    let msg: String = f"Hello, {name}! count={n}";
    PrintLine(msg);
    Test_AssertEqString(msg, "Hello, Bux! count=42");

    let flag: bool = true;
    let bmsg: String = f"flag={flag}";
    Test_AssertEqString(bmsg, "flag=true");

    let empty: String = f"plain";
    Test_AssertEqString(empty, "plain");

    let raw: String = f"use \{braces\} literally";
    Test_AssertEqString(raw, "use {braces} literally");

    Test_Pass("string_interp");
    return 0;
}