Difftastic is a structural diff tool that understands syntax. See the manual to get started, and the changelog for historical changes.
Diffing
Fixed a crash (introduced in 0.59) when the final changed hunk included the last line of the file.
Display
Fixed an issue where files with no common content would show duplicate hunks.
Fixed a performance issue when files had extremely long lines (e.g. 100,000+ characters).