syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // We've emitted an error on the original const, it would be redundant to complain
context_before:                     self.tcx.dcx().create_err(CouldNotEvalConstPattern { span: self.span });
context_after:                 // on its use as well.