quoting inside backquotes in 3.1

[Oliver Kiddle]

Is it intentional that the following script, which worked in 2.05b now
produces errors in 3.1:

: `: "\\""`

That now results in: unexpected EOF while looking for matching ``'
Using a third backslash fixes it but this is inconsistent with ash bash2
bsh ksh pdksh and zsh.

Oliver


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