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Jacob Pratt
2aa5ef1c5f
fixed generics of crate node ICE when `note_and_explain_type_err` is called during dyn-compatibility checking, the `body_owner_def_id` can be `CRATE_DEF_ID` because `ObligationCause::dummy()` uses it as a placeholder when there is no real body owner. calling `generics_of `on `CRATE_DEF_ID `caused an ICE because the crate root is a module and modules don't have generics. the fix guards all `generics_of` call sites by checking whether `body_owner_def_id` is `CRATE_DEF_ID` before attempting to look up generics, and skips the type parameter span labeling in that case. i also added regression test with original ice reproduce fixes rust-lang/rust#152335