Syntax highlighting is a waste of an information channel
Color carries a huge amount of information. Color draws our attention. Color distinguishes things. And we just use it to distinguish syntax.
Nothing wrong with distinguishing syntax. It's the "just" that bothers me.
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I've listed some examples of what we could do with this. If this is something that already exists I included a link.
We can use different colors to mark how nested a set of parenthesis are.
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Highlight different levels of nesting.
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Highlight identifiers imported from a different file.
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Highlight functions that raise errors not caught in their body.
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Highlight functions that were directly called in the bodies of tests that failed in the last test run.