syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"span,"}]}
source_snippet:                             span,
context_before:                         self.tcx.dcx().emit_err(LowerRangeBoundMustBeLessThanOrEqualToUpper {
context_after:                             teach: self.tcx.sess.teach(E0030),