Specialize format! for simple "{}" case#76531

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workingjubilee wants to merge 3 commits intorust-lang:masterfrom

workingjubilee:try-simple-format

Commits on Sep 9, 2020

Specialize format! with pattern-matching
workingjubilee
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Commits on Sep 10, 2020

Minimize expansion on NeedsDisplay
workingjubilee
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Commits on Oct 21, 2020

Simplify to invoking Trait on ident
workingjubilee
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