pandoc latex alltt % (percent) characters are mistakenly interpreted as comments

[drf5n]

This code works for latex processors, but not for pandoc 1.11.1 :

\documentclass{article}
\usepackage{alltt}
\begin{document}
\begin{alltt}
main <- {sprintf("x = %5.3f",3.1415926)}
\end{alltt}
\end{document}

The % makes the closing '}' not be found, and causes failure.

$ pandoc test.tex -t markdown
pandoc:
Error:
"source" (line 5, column 27):
unexpected "{"
expecting letter or new-line

The unexpected "{" is from where "\end{" replaces the text from % onwards.

If you remove the curly braces from the source line, the source compiles, but the line is truncated at the '%':

pandoc junk.tex

main <- sprintf("x =