syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"r1:"}]}
source_snippet:         r1: reg = ["$r1","$ra"],
context_before:     LoongArch LoongArchInlineAsmReg LoongArchInlineAsmRegClass {
context_after:         r4: reg = ["$r4","$a0"],