syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"*FROM_CARGO.get_or_init(||"}]}
source_snippet:     *FROM_CARGO.get_or_init(|| std::env::var_os("CARGO_CRATE_NAME").is_some())
context_before:     // though we may not have been called by Cargo, so we avoid using it.
context_after: }