[1.12] Expr printing is too colorful

[topolarity]

We've started to do syntax highlighting for Expr in 1.12:

This is a lot of visual noise IMO and really makes it harder to read, instead of easier.

It would be good to choose just a few colors to help focus the users attention based on semantics (e.g. expr heads, comments, and constants)

Presumably this is #58408 (cc @tecosaur)

[tecosaur]

Presumably this is 58408

It is indeed. That cuts highlighting down to just strings/chars, comments, and keywords (function, for, if, end, etc.). The plan is to use this simple scheme as an inoffensive starting point for 1.12.

Kristoffer's just flagged that the PR was auto-closed by a backports branch being deleted, so I'll be putting a new PR up some time this week.

[KristofferC]

Added to #58956