syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"Some(\"cross-thread\")"}]}
source_snippet:             Some("cross-thread") => ProcMacroExecutionStrategy::CrossThread,
context_before:             Some("same-thread") => ProcMacroExecutionStrategy::SameThread,
context_after:             _ => return false,