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Handle reporting invariance of fn pointer

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This commit is contained in:
Michael Goulet 2022-04-02 15:27:14 -07:00
parent 60e50fc1cf
commit a8877cf738
3 changed files with 45 additions and 0 deletions
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11
compiler/rustc_borrowck/src/diagnostics/region_errors.rs
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@ -358,6 +358,17 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
);
(desc, note)
}
ty::FnDef(def_id, _) => {
let name = self.infcx.tcx.item_name(*def_id);
let identity_substs =
InternalSubsts::identity_for_item(self.infcx.tcx, *def_id);
let desc = format!("a function pointer to `{name}`");
let note = format!(
"the function `{name}` is invariant over the parameter `{}`",
identity_substs[param_index as usize]
);
(desc, note)
}
_ => panic!("Unexpected type {:?}", ty),
};
diag.note(&format!("requirement occurs because of {desc}",));