11   const rs = new ReadableStream({  constant
34   const reader = rs.getReader();
44   return readableStreamToArray(rs, reader).then(chunks => {
59   const rs = new ReadableStream({  constant
66   rs.cancel(passedReason);
75   const rs = new ReadableStream({  constant
85   const reader = rs.getReader();
87   return rs.cancel().then(() => {
104   const rs = new ReadableStream({  constant
111   return rs.cancel(cancelReason).then(() => {
119   const rs = new ReadableStream({  constant
125   return rs.cancel().then(v => {
136   const rs = new ReadableStream({  constant
143   return rs.cancel('test').then(() => {
156   const rs = new ReadableStream({  constant
163   return rs.cancel(cancelReason);
172   const rs = new ReadableStream({  constant
186   return rs.cancel().then(value => {
198   const rs = new ReadableStream({  constant
214   return rs.cancel().then(() => {
225   const rs = new ReadableStream({  constant
234   return Promise.all([rs.cancel(), rs.getReader().closed]);