syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"(\"ptx40\","}]}
source_snippet:     ("ptx40", Unstable(sym::nvptx_target_feature), &["ptx32"]),
context_before:     ("ptx32", Unstable(sym::nvptx_target_feature), &[]),
context_after:     ("ptx41", Unstable(sym::nvptx_target_feature), &["ptx40"]),