syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // We want `for<..> A == for<..> B` -- therefore we want
context_before:             //
context_after:             // `exists<..> A == for<..> B` and `exists<..> B == for<..> A`.