syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // though we may not have been called by Cargo, so we avoid using it.
context_before:     // Note that it is common in Makefiles to define the `CARGO` env even
context_after:     *FROM_CARGO.get_or_init(|| std::env::var_os("CARGO_CRATE_NAME").is_some())