syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"r2:"}]}
source_snippet:         r2: reg = ["r2", "g2"], // % reserved_g2
context_before:         // be supported via options similar to AArch64's -Z fixed-x18.
context_after:         r3: reg = ["r3", "g3"], // % reserved_g3