Today I learned about the peculiarities of escaping within
single-quotes:

Turns out,

  echo 'foo \\'

emits

  foo \\

rather than escaping the '\'. Curiously, if you need to escape a '
within single-quotes, here's how to do it

  echo 'foo '\'' bar'

which will emit

  foo ' bar

This fixes #10002

(cherry picked from commit 1289048e)