No syntax highlighting with exclamation point operator `!`

Assessment

Research direction

Description

Expressions with the exclamation point operator !, used to send an operating system command, do not have any syntax highlighting.

For example, the expression
!chdir
is completely unhighlighted.

Getting set up

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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