syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"PatKind::Binding"}]}
source_snippet:             PatKind::Binding { mode: BindingMode(ByRef::No, _), var, subpattern: None, .. } => {
context_before:             // Optimize the case of `let x = ...` to write directly into `x`
context_after:                 let place = self.storage_live_binding(