ReuseTokenSource returns a TokenSource which repeatedly returns the same token as long as it's valid, starting with t. When its cached token is invalid, a new token is obtained from src.

ReuseTokenSource is typically used to reuse tokens from a cache (such as a file on disk) between runs of a program, rather than obtaining new tokens unnecessarily.

The initial token t may be nil, in which case the TokenSource is wrapped in a caching version if it isn't one already. This also means it's always safe to wrap ReuseTokenSource around any other TokenSource without adverse effects.

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