https://issues.dlang.org/show_bug.cgi?id=13122

hsteoh@quickfur.ath.cx changed:

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https://issues.dlang.org/show_bug.cgi?id=13122

--- Comment #1 from hsteoh@quickfur.ath.cx ---
Hmm. Isn't this expected behaviour? After all, typeof(a) == immutable(dchar)[],
so shouldn't the cartesianProduct result contain the same element type, i.e.,
immutable(dchar)?

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https://issues.dlang.org/show_bug.cgi?id=13122

--- Comment #2 from hsteoh@quickfur.ath.cx ---
Sorry, I meant, typeof(b).

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https://issues.dlang.org/show_bug.cgi?id=13122

--- Comment #3 from bearophile_hugs@eml.cc ---
(In reply to hsteoh from comment #1)
> Hmm. Isn't this expected behaviour?

Probably yes, but I have opened a discussion thread: http://forum.dlang.org/thread/fxkgafwqeeduxkerzglo@forum.dlang.org

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https://issues.dlang.org/show_bug.cgi?id=13122

Peter Alexander <peter.alexander.au@gmail.com> changed:

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--- Comment #4 from Peter Alexander <peter.alexander.au@gmail.com> ---
(In reply to bearophile_hugs from comment #3)
> (In reply to hsteoh from comment #1)
> > Hmm. Isn't this expected behaviour?
> 
> Probably yes, but I have opened a discussion thread: http://forum.dlang.org/thread/fxkgafwqeeduxkerzglo@forum.dlang.org

Don't want to bump the thread.

The reason filtering a string yields dchar instead of immutable(dchar) is because string.front returns a decoded dchar by value. On the other hand iterating a dstring returns the dchar by ref, so you see its immutability.

Shall we close this bug?

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https://issues.dlang.org/show_bug.cgi?id=13122

bearophile_hugs@eml.cc changed:

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             Status|NEW                         |RESOLVED
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--- Comment #5 from bearophile_hugs@eml.cc ---
(In reply to Peter Alexander from comment #4)

> The reason filtering a string yields dchar instead of immutable(dchar) is because string.front returns a decoded dchar by value. On the other hand iterating a dstring returns the dchar by ref, so you see its immutability.
> 
> Shall we close this bug?

The current behaviour is is a little strange, but I guess you are right. I close this down then, as invalid.

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https://issues.dlang.org/show_bug.cgi?id=13122

--- Comment #6 from hsteoh@quickfur.ath.cx ---
Yet another unfortunate consequence of autodecoding. :-(

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