src/language-handlebars/printer-glimmer.js/printCloseBlock
function printCloseBlock(path, print) {
  const node = path.getValue();

  return concat([
    blockStatementHasOnlyWhitespaceInProgram(node) ? softline : hardline,
    printClosingBlockOpeningMustache(node),
    path.call(print, "path"),
    printClosingBlockClosingMustache(node),
  ]);
}