26     ast.nodes.forEach(function addNode(node) {  argument
40     walk(parent, function (node) {  argument
66   walk(ast, function before(node) {  argument
88   walk(ast, function before(node) {  argument
112   }, function after(node) {  argument
120   return walk(ast, function before(node, replace) {  argument
124   }, function after(node, replace) {  argument
135   return walk(ast, function (node, replace) {  argument
148   ast = walk(ast, null, function (node, replace) {  argument
155   function defaultYieldLocation(node) {  argument
176   walk(ast, function (node) {  argument