syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"#[diag(mir_build_could_not_eval_const_pattern)]"}]}
source_snippet: #[diag(mir_build_could_not_eval_const_pattern)]
context_before: #[derive(Diagnostic)]
context_after: pub(crate) struct CouldNotEvalConstPattern {