syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let else_block_span = this.thir[*else_block].span;
context_before:                     // enclosing the rest of the `let .. else ..` parts.
context_after:                     // This place is not really used because this destination place