syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"altivec:"}]}
source_snippet:                 altivec: VecI8(16), VecI16(8), VecI32(4), VecF32(4);
context_before:             Self::vreg => types! {
context_after:                 vsx: F32, F64, VecI64(2), VecF64(2);