syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"r30:"}]}
source_snippet:         r30: reg, reg_upper = ["r30", "ZL"],
context_before:         r27: reg, reg_upper = ["r27", "XH"],
context_after:         r31: reg, reg_upper = ["r31", "ZH"],