Skip concurrent fetch with fewer than 2 downloads
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@ -36,7 +36,9 @@ module Homebrew
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sig { void }
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def fetch
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if concurrency == 1
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return if downloads.empty?
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if concurrency == 1 || downloads.one?
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downloads.each do |downloadable, promise|
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promise.wait!
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rescue ChecksumMismatchError => e
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