Factor out foldable better to reduce code duplication. #14158
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… "double dispatch" pattern that lets you easily write new folders and then apply them to various structures, reusing the "folding" effort.
bors
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…, r=pcwalton Factor out foldable better to reduce code duplication. r? @pcwalton (probably want to let travis run...)
flip1995
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…st-lang#14158) changelog: [`question_mark`]: avoid incorrect suggestion when `ref` binding used Fixes rust-lang#13417
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Factor out foldable better to reduce code duplication.
r? @pcwalton (probably want to let travis run...)