97b963b44b
3706: missing match arms diagnostic r=flodiebold a=JoshMcguigan Following up on https://github.com/rust-analyzer/rust-analyzer/pull/3689#issuecomment-602718222, this PR creates a missing match arms diagnostic. At the moment this is a very early draft, but I wanted to open it just to get some initial feedback. Initial questions: * Have I roughly created the correct boilerplate? * Inside the new `validate_match` function: * Am I correct in thinking I want to do validation by comparing the match arms against `match_expr`? And when analyzing `match_expr` I should be looking at it as a `hir_def::expr::Expr`? * I mostly copied the chained if-let statements from the struct validation. Shouldn't there be a non-failable way to get an AstPtr from the hir data structures? Thanks for all the guidance. Co-authored-by: Josh Mcguigan <joshmcg88@gmail.com>
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