Forcing backslash to be treated as ordinary string character

[John Gunther <postgresql@xxxxxxxxxxxxxxxx>]

Doc section 4.1.2.1 says that in future, backslashes will be treated as
ordinary string characters. It says to use the "E" string prefix to
ensure that backslashes are permanently treated as escape characters.

Question: Aside from "dollar quoting" (Section 4.1.2.2), is there any
way NOW to force backslashes in string constants to be treated as
ORDINARY characters?

Thanks