syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"this.expr_into_dest(destination,"}]}
source_snippet:                     this.expr_into_dest(destination, continuation, rhs).into_block();
context_before:                 let mut rhs_block =
context_after:                 // Instrument the lowered RHS's value for condition coverage.