syntax_data: {"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // wasm64 was designed.
context_before:     // features since they were all merged into the official spec by the time
context_after:     options.features = "+bulk-memory,+mutable-globals,+sign-ext,+nontrapping-fptoint".into();