{"ast_node_type":"function","tokens":[{"end":54,"kind":"keyword","start":0,"text":"fn"}]}
    fn const_null(&self, t: &'ll Type) -> &'ll Value {
impl<'ll, 'tcx> ConstCodegenMethods for CodegenCx<'ll, 'tcx> {
        unsafe { llvm::LLVMConstNull(t) }