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I just examined a set of 133 Scheme source files of from guile version 1.8,
and every one of them is "well-formed". That is, the sweet-expression reader
interprets them the same way as an s-expression reader.
To confirm this, I used the new "diff-s-sweet" tool
(in the readable project "develop" directory) and ran:
find /usr/share/guile/1.8 -type f -name '*.scm' -exec ./diff-s-sweet -P -S -w {} \+
I think that's great evidence that sweet-expressions are very backward-compatible
with traditional s-expressions.
--- David A. Wheeler