syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"st7:"}]}
source_snippet:         st7: x87_reg = ["st(7)"],
context_before:         st6: x87_reg = ["st(6)"],
context_after:         tmm0: tmm_reg = ["tmm0"] % x86_64_only,