syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"x0,"}]}
source_snippet:                     x0, x1, x2, x3, x4, x5, x6, x7,
context_before:                     // x13 and x14 cannot be used in Arm64EC.
context_after:                     x8, x9, x10, x11, x12, x15,