try/catch idiom in std.datetime

[Walter Bright]

On 11/18/2013 4:23 AM, Jacob Carlborg wrote:
> Does all architectures support the HLT instruction or equivalent? The spec
> explicitly says HLT is used on x86.

Most architectures I've used supported a HLT, and there's always something the 
back end could construct if it had to, even:

      ...
      call halt
      ...