Avoid panic branch in EscapeDefault::backslash
and EscapeDebug::backslash
.
#121805
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See japaric/ufmt#52 and https://github.com/andrewgazelka/ufmt/blob/e97ce1a86cfcc9fa36ffab6ee62762c00e4b3fc9/src/impls/core.rs#L62.
This avoids the unreachable panicking branch in
char::escape_debug
.Not sure what the best way to test this is.