syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // resulting from the final codegen session.
context_before:     // non-monomorphic layouts, as the user only wants to see the stuff
context_after:     if layout.ty.has_non_region_param() || !cx.typing_env.param_env.caller_bounds().is_empty() {