syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Maybe, this is a FIXME
context_before:     // For types generating PassMode::Cast, InRegs will not be set.
context_after:     let has_casts = fn_abi.args.iter().any(|arg| matches!(arg.mode, PassMode::Cast { .. }));