When defining a LaTeX macro, subsequent occurrences of \renewcommand or \providecommand with 'bare' command name (i.e. not enclosed in { }) fails because the (bare) command name gets wrongly expanded.

Input:

\newcommand{\foo}{123}\renewcommand\foo{456}\foo

Expected output:

456

Actual output (with 2.1.3 from git master):

$ echo '\newcommand{\foo}{123}\renewcommand\foo{456}\foo' | stack exec pandoc -- -f latex -t native

Error at "source" (line 1, column 36):
unexpected 123
\newcommand{\foo}{123}\renewcommand\foo{456}\foo
                                   ^