GNU Guile 2.1.1 发布，Scheme 实现
** 速度The biggest change in Guile 2.2 is a complete rewrite of its virtual
machine and compiler internals. The result is faster startup time,
better memory usage, and faster execution of user code. See the
"Performance improvements" section below for more details.
** 更好的线程安全
This new release series takes the ABI-break opportunity to fix some
interfaces that were difficult to use correctly from multiple threads.
Notably, weak hash tables are now transparently thread-safe. Ports are
also thread-safe; see "New interfaces" below for details on the changes
to the C interface.
** Better space-safety
It used to be the case that, when calling a Scheme procedure, the
procedure and arguments were always preserved against garbage
collection. This is no longer the case; Guile is free to collect the
procedure and arguments if they become unreachable, or to re-use their
slots for other local variables. Guile still offers good-quality
backtraces by determining the procedure being called from the
instruction pointer instead of from the value in slot 0 of an
application frame, and by using a live variable map that allows the
debugger to know which locals are live at all points in a frame.
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