syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"#[diag(mir_build_unreachable_pattern)]"}]}
source_snippet: #[diag(mir_build_unreachable_pattern)]
context_before: #[derive(LintDiagnostic)]
context_after: pub(crate) struct UnreachablePattern<'tcx> {