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More precise spans for temps and their drops #55781
This PR has two main enhancements:
Each of these individually increases the precision of our diagnostic output; together they combine to make a much clearer picture about the control flow through the spans.
This example, by the way, seems to be a particular variant of the kind of code that inspired me to make PR #54782 (cc #54556), which tried to lead the developer to consider adding a semicolon to the end of the inner tail expression.
I am not 100% sure why that suggestion is not being issued here; my best guess is that the