syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"Err(TypeError::ConstMismatch(_))"}]}
source_snippet:                 Err(TypeError::ConstMismatch(_)) => {
context_before:                 Ok(sz) => Ok(Ty::new_array_with_const_len(cx, t, sz)),
context_after:                     Err(TypeError::ArraySize(ExpectedFound::new(sz_a, sz_b)))