adjustwidth and newenvironment

Edit: thank you for commenting. I’ve edited the question to use lstnewenvironment but it keeps giving the same error. I will keep the question here while I go read the lstlistings manual.

The following code works for me when used inside the document:

begin{adjustwidth*}{0pt}{-5cm}
begin{lstlisting}
function test() { return (void *) test_func(a, b, 3); }
end{lstlisting}
end{adjustwidth*}

But when I want to create a custom environment for it, Overleaf gives me the error

job aborted, no legal end found.

MWE:

documentclass{article}
usepackage[right=10cm]{geometry}    % Create a large right margin
usepackage{listings}
usepackage{changepage}

% Create a new environment for code samples that can extend into the outer margin.
lstnewenvironment{config}{%
   begin{adjustwidth*}{0pt}{-5cm}
}{%
   end{adjustwidth*}
}

begin{document}
begin{config}
function test() { return (void *) test_func(a, b, 3); } asdfasdfa asdf
end{config}
end{document}

documentclass{article}
usepackage[right=10cm]{geometry}    % Create a large right margin
usepackage{listings}
usepackage{lipsum}

% Create a new environment for code samples that can extend into the outer margin.
lstnewenvironment{config}[1][]{lstset{xrightmargin=-5cm,#1}}{}

lstset{basicstyle=ttfamily,columns=fullflexible} % so my eyes don't bleed

begin{document}

lipsum[1][1-4]

begin{config}
function test() { return (void *) test_func(a, b, 3); } asdfasdfa asdf
end{config}

end{document}