syntax_data: {"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if let ty::Adt(adt_def, ..) = pat.ty.kind() {
context_before:             PatKind::Leaf { subpatterns, .. } => {
context_after:                     for pat in subpatterns {