sh vs. bash -xc 'a=b c=$a'

[Dan Jacobson]

It seems these should both make one line "+ a=b c=b" output,

for s in sh bash
do $s -xc 'a=b c=$a'
done

I mean they give the same results, but bash splits it into
two lines, so the user reading the bash -x output cannot tell
if one (correct) or two (incorrect) lines were used.
They can tell with sh -x.

By the way, I looked up and down the man page,
and wasn't sure if it says one should expect
$c to end up as c= or c=b in fact!

And I'm not sure the man page says to expect two lines or one of -x
output either, when using sh vs. bash.