syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"(\"altivec\","}]}
source_snippet:     ("altivec", Unstable(sym::powerpc_target_feature), &[]),
context_before:     // tidy-alphabetical-start
context_after:     ("msync", Unstable(sym::powerpc_target_feature), &[]),