syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // FIXME(#134288): This may change for the `-msvc` targets in the future.
context_before:                         // `i128` is returned in xmm0 by Clang and GCC
context_after:                         let reg = Reg { kind: RegKind::Vector, size: Size::from_bits(128) };