Guile supports the R7RS idiom whereby this:
"foo\
bar"
reads as
"foobar"
In the R6RS, this syntax is specified as allowing intraline whitespace
(space, tab, and anything Unicode with category Zs) after the \ but
before the newline. However in Guile we don't support this and signal
an error instead ("illegal character in escape sequence: #\space").
Probably we should relax this restriction and allow intraline whitespace
after the \ and before the newline.
