syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let is_call =
context_before:                 let source_expr = &this.thir[source];
context_after:                     matches!(source_expr.kind, ExprKind::Call { .. } | ExprKind::InlineAsm { .. });