How to use `format` to repeat a character

[Bahman Movaqar via Digitalmars-d-learn]

I'm sure I'm missing something very simple but how can I create a string
like "----" using `format`?
I check the docs on `format` and tried many variations including
`format("%.*c\n", 4, '-')` but got nowhere.

I'd appreciate any hint/help on this.

-- 
Bahman Movaqar

http://BahmanM.com - https://twitter.com/bahman__m
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