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This is caused by the indenting of /** multi-line */ blocks, it was matching the 4-space-indent and being considered code. This included the last line */ so it didn't "exit" the comment properly.

For testing, I duplicated everything in the comments file and put it inside a class so it was indented enough. After the fix, the only change was the bit we wanted:

@devoncarew FYI. It's possible I introduced this with one of the earlier changes, so if you don't have them you might not need this. Best way is to type stdio and then Go-to-Def on it, and see whether most of the file is green/comment.

I've scanned through a few of the large Flutter files and made sure there are no other obvious instances of anything like this, nor any files that are comments till the end.