[Issue 10109] add -transition compiler switch to aid in dealing with breaking changes

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10109



--- Comment #3 from bearophile_hugs at eml.cc 2013-05-17 15:38:31 PDT ---
(In reply to comment #2)
> What's "id"? Isn't it better for "id" to be just the version number of the
> compiler? The version number is easy to understand for final users, while
> Bugzilla issue numbers or other numbers are less easy to remember and use.

dmd -transition=?

Currently prints:

Language changes listed by -transition=id:
  =field,3449    do list all non-mutable fields occupies object instance
  =tls           do list all variables going into thread local storage

So id is a string and there is a key. I think this is OK. Sorry for the noise.

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