Rewrite partition_source to return slices #2840
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This changes partition_source so that instead of allocating new strings, it just returns slices into the original string. It probably doesn't make a big difference perf-wise, but I felt more comfortable with this, and also felt it was a little easier to understand exactly what it was doing. This is generally equivalent except for the possibility of not having a newline at the end. In practice that doesn't matter because markdown code blocks always have a newline. However, to be defensive, the caller will check for this.
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This changes partition_source so that instead of allocating new strings,
it just returns slices into the original string. It probably doesn't
make a big difference perf-wise, but I felt more comfortable with this,
and also felt it was a little easier to understand exactly what it was
doing.
This is generally equivalent except for the possibility of not having a
newline at the end. In practice that doesn't matter because markdown
code blocks always have a newline. However, to be defensive, the caller
will check for this.