Mon Dec 11 2017 00:10:52 UTC
absence of bug is not bug of absence.
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ID Product Comp Assignee Status Resolution Summary Changed
51163 Compiler C# masafa RESO DUPL mcs build results in "An item with the same key has already been added" 2017-01-02
One bug found.

as

File a new bug in the "C#" component of the "Compilers" product