syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // 1) Instead of mangling only *used*
context_before:         // make this not an "okay" mangling:
context_after:         // bound vars, we want to mangle *all* bound vars (`for<'b> Send` is a