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dfe05c0ea0
Check node kind to avoid ICE in `check_expr_return()`
This PR fixes #86721. The ICE described there is apparently due to a misunderstanding:
e98897e5dc/compiler/rustc_typeck/src/check/expr.rs (L684-L685)
Intuitively, one would think that calling `expect_item()` after `get_parent_item()` should succeed, but as it turns out, `get_parent_item()` can also return foreign, trait, and impl items as well as crates, whereas `expect_item()` specifically expects a `Node::Item`. I have therefore added an extra check to prevent this ICE.