Mac compilation error

General
2

In a fantastically unique edge-case, one of your variable declarations is colliding with a system macro:

In file included from stanExports_irt.cc:5:
./stanExports_irt.h:638:10: error: expected member name or ';' after declaration specifiers
  double BSD;
  ~~~~~~ ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/param.h:72:17: note: expanded from macro 'BSD'
#define BSD     199506          /* System version (year & month). */
                ^
In file included from stanExports_irt.cc:5:
./stanExports_irt.h:1437:11: error: expression is not assignable
      BSD = std::numeric_limits<double>::quiet_NaN();
      ~~~ ^
./stanExports_irt.h:1439:11: error: expression is not assignable
      BSD = context__.vals_r("BSD")[(1 - 1)];
      ~~~ ^
3 errors generated.

I’d guess that it would fail similarly for other BSD-based systems as well

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