syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"(&ty::Array(a,"}]}
source_snippet:             (&ty::Array(a, _), &ty::Slice(b)) => {
context_before:             // `[T; n]` -> `[T]`
context_after:                 let InferOk { obligations, .. } = self