syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// we push a frame here tracking whether we are building a statement or
context_before:     /// The block-context: each time we build the code within an thir::Block,
context_after:     /// if we are pushing the tail expression of the block. This is used to