[Tex/LaTex] why doesn’t `\;` given a new linebreak in algorithm2e

Question

Here is minimal working example:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}
\usepackage{algorithm}
\usepackage[algo2e]{algorithm2e}


\begin{document}


\newcommand{\nextnode}{\ensuremath{\text{Next}}}
\newcommand{\intree}{\ensuremath{\text{InTree}}}


\begin{algorithm}[H]
\KwData{}
\KwResult{}
asdf\;
$\nextnode[r] \leftarrow nil$\;
$\intree[r] \leftarrow true$\;
\caption{}
\end{algorithm}

\end{document}

With the output:

I am expecting line breaks, but it just doesn't happen.

Why?

Answer 1

You have loaded the algorithm2e package with the algo2e option. This changes the name of the environment to algorithm2e. Using that name works as expected:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}
\usepackage{algorithm}
\usepackage[algo2e]{algorithm2e}


\begin{document}


\newcommand{\nextnode}{\ensuremath{\text{Next}}}
\newcommand{\intree}{\ensuremath{\text{InTree}}}


\begin{algorithm2e}[H]
\KwData{}
\KwResult{}
asdf\;
$\nextnode[r] \leftarrow nil$\;
$\intree[r] \leftarrow true$\;
\caption{}
\end{algorithm2e}

\end{document}