Follow-up Comment #5, bug #67978 (group groff): [comment #4 comment #4:] > Another diagnostic is similar, but not necessarily indicative of a problem. >
> troff:<standard input>:517: error: invalid argument '�' to output
> suppression escape sequence
>
> The argument to the output suppression escape sequence is a single decimal
> digit, not an identifier. ...
No bug here. In a Latin-1-encoded terminal we see a Latin-1 character...
troff:<standard input>:517: error: invalid argument 'ö' to output suppression
escape sequence
...which is fine. GNU _troff_ is deliberately not in the business of
transcoding invalid character codes to emit them in diagnostic messages.
In the future, once GNU _troff_ natively accepts UTF-8 input, we might simply
report such codes' integer values, and do so in hexadecimal since that's the
universally employed number base for identifying UTF-8 code points. This
might be a point worth adding to bug #40720.
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