Backport "fix: make vals created in desugaring of n-ary lambdas non-synthetic" to 3.3 LTS#600

tgodzik merged 1 commit intolts-3.3scala/scala3-lts:lts-3.3from

backport-lts-3.3-23896scala/scala3-lts:backport-lts-3.3-23896Copy head branch name to clipboard