syntax_data: {"ast_node_type":"enum","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // `x0`..`x30` enum variants don't all match the register number. E.g. the
context_before:         // `x19` and `x29` are missing and the integer constants for the
context_after:         // integer constant for `x18` is 18, but the constant for `x20` is 19.