fs-mistrust semver violation (if not fixed before release)

Seen in the diff

-    pub fn check<P: AsRef<Path>>(self, path: P) -> Result<()> {
+    pub fn check<P: AsRef<Path>>(&self, path: P) -> Result<()> {

etc. This is a breaking change. It's not part of !2270 (merged) or the main version update MR I'm making. I'll make a followup.