[Issue 12544] Differences in ubyte/char enum printing

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12544


monarchdodra at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |monarchdodra at gmail.com


--- Comment #1 from monarchdodra at gmail.com 2014-04-08 06:54:41 PDT ---
The code goes through the "formatRange" branch of `std.format`.

In format range, the code checks if it is a range of chars:
- range of chars => print string (eg: aaaaaaa...)
- range of non-chars => print array (eg: [A, A, A, A, A...

The issue is one of determining "what is a char"?

Currently, the code uses:
is(CharTypeOf!(ElementType!T))

Which mean any type that implicitly casts to char is fair game (including
structs with "alias this").

*Arguably*, I think `isSomeChar` would be better, as it only accepts *actual*
chars.

But even then, it would still accept enums whose base type is char, as
technically, they *are* chars.

Unfortunately, there is always ambiguity when asking to print an enum of a char
or string.

I don't know either if this is bug or working as designed. (I don't think it's
a regression though... did you test other versions?)

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