syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"self.dcx().emit_warn(errors::AppleDeploymentTarget::TooLow"}]}
source_snippet:                         self.dcx().emit_warn(errors::AppleDeploymentTarget::TooLow {
context_before:                     if version < os_min {
context_after:                             env_var,