syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"ax:"}]}
source_snippet:         ax: reg, reg_abcd = ["ax", "eax", "rax"],
context_before:     X86 X86InlineAsmReg X86InlineAsmRegClass {
context_after:         bx: reg, reg_abcd = ["bx", "ebx", "rbx"] % rbx_reserved,