syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"x30:"}]}
source_snippet:         x30: reg = ["x30", "w30", "lr", "wlr"],
context_before:         x28: reg = ["x28", "w28"] % restricted_for_arm64ec,
context_after:         v0: vreg, vreg_low16 = ["v0", "b0", "h0", "s0", "d0", "q0", "z0"],