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7528fdc4c4
The assertion in `assert-long-condition.rs` used to be fail like this, all on
one line:
```
thread 'main' panicked at 'assertion failed: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18\n + 19 + 20 + 21 + 22 + 23 + 24 + 25 == 0', tests/ui/macros/assert-long-condition.rs:7:5
```
The `\n` and subsequent indent is because the condition is pretty-printed, and
the pretty-printer inserts a newline. Printing the newline in this way is
arguably reasonable given that the message appears within single quotes, which
is very similar to a string literal.
However, after the assertion printing improvements that were released in 1.73,
the assertion now fails like this:
```
thread 'main' panicked at tests/ui/macros/assert-long-condition.rs:7:5:
assertion failed: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18\n + 19 + 20 + 21 + 22 + 23 + 24 + 25 == 0
```
Now that there are no single quotes around the pretty-printed condition, the
`\n` is quite strange.
This commit gets rid of the `\n`, by removing the `escape_debug` done on the
pretty-printed message. This results in the following:
```
thread 'main' panicked at tests/ui/macros/assert-long-condition.rs:7:5:
assertion failed: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18
+ 19 + 20 + 21 + 22 + 23 + 24 + 25 == 0
```
The overly-large indent is still strange, but that's a separate pretty-printing issue.
This change helps with #108341.
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