syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"self.tcx.dcx().create_err(CouldNotEvalConstPattern"}]}
source_snippet:                     self.tcx.dcx().create_err(CouldNotEvalConstPattern { span: self.span });
context_before:                 let mut err =
context_after:                 // We've emitted an error on the original const, it would be redundant to complain