syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // otherwise they're basically ignored by the standard library. In this
context_before:         // When the atomics feature is activated then these two keys matter,
context_after:         // mode, however, the `#[thread_local]` attribute works (i.e.