librustc: Disallow mutation and assignment in pattern guards, and modify#15989
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pcwalton wants to merge 1 commit intorust-lang:masterfrom
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librustc: Disallow mutation and assignment in pattern guards, and modify#15989pcwalton wants to merge 1 commit intorust-lang:masterfrom
pcwalton wants to merge 1 commit intorust-lang:masterfrom
