A compilation bug brought by vs2015 Update1 update [existing solutions]

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Blow one VS2015 Update1 The compilation brought by the update BUG【 There are solutions 】

Reference article ：

（1） Blow one VS2015 Update1 The compilation brought by the update BUG【 There are solutions 】

（2）https://www.cnblogs.com/guomingfeng/p/roslyn-bug-001.html

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