{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"self.tcx.dcx().emit_fatal(errors::ExplicitTailCallsUnsupported);"}]}
        self.tcx.dcx().emit_fatal(errors::ExplicitTailCallsUnsupported);
        // FIXME: implement support for explicit tail calls like rustc_codegen_llvm.
    }