syntax_data: {"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let subpattern_user_tys = user_tys.leaf(subpattern.field);
context_before:                 for subpattern in subpatterns {
context_after:                     debug!("visit_primary_bindings: subpattern_user_tys={subpattern_user_tys:?}");