-- iteration 37: the backtick raw text literal. Markup is written as
-- markup -- one literal, real newlines, quotes verbatim -- and the
-- source indentation is removed at compile time, so the served bytes
-- carry the markup's own nesting and not the method's.
-- `${...}` interpolates raw; `{{ ... }}` HTML-escapes through the `esc`
-- in scope (here a local one, which is exactly how a program overrides
-- writeonce-view's).
fn esc(t: Text) -> Text {
  let out = "";
  let i = 0;
  let n = len(t);
  while i < n {
    let b = byte_at(t, i);
    if b == 60 { out = out .. "&lt;"; }
    else {
      if b == 62 { out = out .. "&gt;"; }
      else { out = out .. substr(t, i, 1); }
    }
    i = i + 1;
  }
  return out;
}

fn main() -> Int {
  let name = "<script>";
  let card = `
    <div class="card">
      <h3>{{ name }}</h3>
      <p>${name}</p>
    </div>`;
  print(card);
  let plain = `no newline, no margin rule`;
  print(plain);
  return 0;
}