[Issue 11714] Improve error message for wrongly initialized thread-local class instances

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https://d.puremagic.com/issues/show_bug.cgi?id=11714



--- Comment #7 from Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> 2013-12-12 02:18:32 PST ---
(In reply to comment #6)
> With *a* reference to – I stripped out the articles trying to make the error
> message as concise as possible, and missed that it would distort the meaning.

Easier to use "with a reference to" and "with respect to" respectively, for the
two different cases (just for future reference:-).

What I'm really concerned about, though, is that to me that message is still
pretty much incomprehensible about what it is that I actually did wrong.  Even
when clarified with instructions about what to do to resolve it (initialize to
null or use static this) it's not obvious about what I got wrong or why it's
wrong.

If I understand the logic right, the result of "new MyClass" is not knowable at
compile time --> hence, a compile time constant; but inferring the former
meaning from the latter is not obvious unless one already knows.  Rather than
requiring the programmer's knowledge and understanding to comprehend the error
message, we should aim to use the error message to _increase_ the programmer's
knowledge and understanding.

So, I want an error message that idiots like me can read and go, "Oh! THAT's
why it's wrong," as well as understanding how to fix it. :-)

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