Assume the following text file `test.tex`:
```
\def\ExplFileDate{2026-06-18}
\starttext
foo
\stoptext
```
Using a recent version of ConTeXt (2026.07.06), compiling this file with the
command `context --luatex test.tex` works OK and produces the expected PDF
output. Compiling this file with the command `context test.tex` produces the
warnings "latex expl stuff loaded, beware of side effects", "latex backend code
loaded, this can badly interfere", and "quitting run, use --fragile" in the log
and the resulting PDF is incomplete (only 21 bytes). Using the command `context
--fragile test.tex` only silences the last two warnings but still produces an
incomplete PDF; this seems to be a bug, since I assume that the purpose of the
flag `--fragile` is precisely to allow the compilation even if expl3 use is
suspected.
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