Opening environment inside command definition breaks highlighting

[MrQubo]

Prerequisites

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Description

Highlighting gets broken when \begin and \end are used inside command definitions.

Minimum working example

\newcommand{\leqn}{\begin{equation}}
\newcommand{\reqn}{\end{equation}}

[Aerijo]

Seems kind of unavoidable, but I’m thinking a similar solution to the one I suggest in #155. This way, any bad highlighting would (hopefully) be confined to the group.

[yudai-nkt]

Your MWE is not recommended. See the comment section of this question on TeX.SX for example.