mers/examples/02_Calc_Sum.mers

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total := 0.0
{() -> {
("Total: ", total, ". Type a number to change.").concat.println
().read_line.trim.parse_float.try((
n -> &total = (total, n).sum,
// not a number, so return a 1-tuple to break from the loop
() -> (())
))
}}.loop
"Goodbye.".println