Highlight circular references #56663
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The text `"#= circular reference @-$d =#"` is printed yellow. Adds a test with the context `:color => true`.
nsajko
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The text
"#= circular reference @-$d =#"is printed yellow. Adds a test with the context:color => true.A straw poll on Slack suggests this is an improvement, with 16 in favor (including myself) and 6 opposed as of the time of writing.
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