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Version 18.104.22.168, xamarin repo
var b = new bool[3, 3];
bool bit = true ? b [1, 2] : b [2, 1];
Unexpected symbol ?
Unexpected symbol 2
Unexpected symbol 1
If b is only a one dimensional array it works.
bool bit = true ? b  : b ;
Also the following compiles
bool bit = true ? (b [1, 2]) : b [2, 1];
But this doesn't
bool bit = true ? b [1, 2] : (b [2, 1]);
*** This bug has been marked as a duplicate of bug 23319 ***