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+- Revised semantics and implementation of _Alignas(N) attribute
+ to better match those of GCC and Clang.
+- Recognize __builtin_fabs as an operator, not just a builtin,
+ enabling more aggressive optimizations.
+- Fixed incorrect hypothesis on __builtin_write{16,32}_reversed.
+- Fixed syntax error in __attribute__((__packed__)).
+- Emit clean compile-time error for 'switch' over a value of 64-bit
+ integer type (currently not supported).
+
+
Release 2.1, 2013-10-28
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