Doesn't show correct output for "Unused global option(s):"

[tyilo]

When latex gives the warning "Unused global option(s):", latexrun doesn't show which options are unused. Compare the output of latexrun and pdflatex below:

Test file (foo.tex):

\documentclass[english]{article}

\begin{document}
Foo
\end{document}

$ latexrun foo.tex
foo.tex: warning: Unused global option(s):

$ pdflatex foo.text
...
LaTeX Warning: Unused global option(s):
    [english].
...