syntax_data: {"ast_node_type":"other","tokens":[{"end":108,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // `MCP: Low level components for async drop`(https://github.com/rust-lang/compiler-team/issues/727)
context_before:         // These lang items are not actually defined in core/std. Experiment is a part of
context_after:         default_trait1,