Changelog #346

#23384 support completions inside cfg!():

#23375 (first contribution) watch include roots recursively only once, on directory.

#23370 (first contribution) fix broken server binary check.

#23359 (first contribution) cache macro-expanded roots when climbing ancestors.

#23367 work around a panic when the trait solver re-enters itself.

#23368 return an early error on unsupported string binary operations.

#23360 include working directory when discovery command fails.

#23308 refactor SyntaxContext to not reimplement salsa macros.