syntax_data: {"ast_node_type":"impl","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // parents, e.g. it's nested in `impl foo::Trait for Bar`
context_before:                         // in cases where the `extern crate foo` has non-trivial
context_after:                         // (see also issues #55779 and #87932).