syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:                 for subpattern in subpatterns {
context_before:             PatKind::Variant { adt_def, args: _, variant_index, ref subpatterns } => {
context_after:                     let subpattern_user_tys =