Github user ozymaxx commented on the issue:
https://github.com/apache/thrift/pull/1496
The AppVeyor builder with the `MSVC2013` configuration generates large
double constants differently as the old `MSVC2010` configuration used to do. So
I will add a condition to not do the `TestRenderedDoubleConstants` test on that
builder. I also suspect that this problem might be due to the architecture
(x86). The result of the `CYGWIN x86` builder will give us some clue on this. ---
