syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// simplify the diagram. For an arm with no guard the blocks marked 3 and
context_before:     /// All of the different arms have been stacked on top of each other to
context_after:     /// 4 and the fake borrows are omitted.