libsyntax: Forbid escapes in the inclusive range \x80
-\xff
in Unicode characters and strings.
#18504
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Use
\u0080
-\u00ff
instead. ASCII/byte literals are unaffected.This PR introduces a new function,
escape_default
, into the ASCIImodule. This was necessary for the pretty printer to continue to
function.
RFC #326.
Closes #18062.
[breaking-change]
r? @aturon