test-repo/changelog_unreleased/javascript/pr-8431.md

Support Private Fields in in (#8431 by @sosukesuzuki)

Support Stage-2 proposal Private Fields in in.

// Input
#prop in obj;

// Prettier stable
SyntaxError: Unexpected token (1:1)
> 1 | #prop in obj;
    | ^
  2 | 

// Prettier master
#prop in obj;