Check that the correct character is used for indentation.
Details
Currently, only supports linting in the presence of tabs.
Much ink has been spilled on this topic, and we encourage you to check out references for more information.
References
https://www.jwz.org/doc/tabs-vs-spaces.html
https://blog.codinghorror.com/death-to-the-space-infidels/
See also
linters for a complete list of linters available in lintr.