Fix emphasis roundtrip in docs #2427
Merged
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Fixes #2408
This changes the lexer and pretty-printer for doc literals slightly. Underscores are now allowed inside emphasis elements surrounded by
__, as long as there are strictly fewer_inside than around.When pretty-printing, we print as many
_as necessary so that it's one more than the longest run of_inside the element.Same for
**and~~and''.This also changes the meaning of
*and_so that now any number of*means "bold" and any number of_means "italic".