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%% utf8ienc.dtx  (with options: `test')
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\ProvidesFile{utf8-test.tex}
   [2014/09/29 v1.1m UTF-8 support for inputenc]

\documentclass{article}

\usepackage[latin1,utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{trace}

\scrollmode  % to run past the error below

\begin{document}

 German umlauts in UTF-8: ^^c3^^a4^^c3^^b6^^c3^^bc  %%% äöü

\inputencoding{latin1}  % switch to latin1

 German umlauts in UTF-8 but read by latin1 (and will produce one
 error since \verb=\textcurrency= is not provided):
 ^^c3^^a4^^c3^^b6^^c3^^bc

\inputencoding{utf8}    % switch back to utf8

 German umlauts in UTF-8: ^^c3^^a4^^c3^^b6^^c3^^bc

Some codes that should produce errors as nothing is set up
for them: ^^c3F ^^e1^^a4^^b6

And some that are not legal utf8 sequences: ^^c3X ^^e1XY

\showoutput
\tracingstats=2
\stop
\endinput
%%
%% End of file `utf8-test.tex'.
