syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if is_primary {
context_before:             PatKind::Binding { name, mode, var, ty, ref subpattern, is_primary, .. } => {
context_after:                     f(self, name, mode, var, pattern.span, ty, user_tys);