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From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: l3messages
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Will Robertson wrote:
> On 12/09/2008, at 5:48 AM, Joseph Wright wrote:
> 
>> ! The key `/test/key three' is unknown
>> and is being ignored.
>> \err_display_aux:w ...wline: and is being ignored}
>>
>> l.16 \keys_manage:n{/text/key~three}
>>
>> ?
>>
>> Notice the odd line \err_diplay ... Have I missed something here?
> 
> Isn't this how TeX (annoyingly) always prints these errors?
> In LaTeX2e I think there's just some whitespace padding to avert
> attention from it.

Not really.  Using your example file:

LaTeX error on line 37 of file no file.
      See LaTeX manual for explanation.
      Type  H <return>  for immediate help.
! This is an error with one arg: ` hello '.
\err_display_aux:w ...an error with one arg: `#1'}

l.37 ...pt:NNw \c_errfile_tlp \err_lbl_a { hello }

?

Using \PackageError {package} {A traditional error} \@ehc:

! Package package Error: A traditional error.

See the package package documentation for explanation.
Type  H <return>  for immediate help.
 ...

l.45 @ehc\endcsname}

?

We still have the TeX part starting with the number, but no code line
directly underneath the test.
-- 
Joseph Wright