Usage

consec(function * () {
var res1 = yield Promise.resolve('abc')
return yield Promise.resolve(res1)
}).then(function (res) {
res // => 'abc'
})

// you can also yield regular values
consec(function * () {
var res1 = yield 'abc'
return yield res1
}).then(function (res) {
res // => 'abc'
})

// you can pass in the function context and parameters
var ctx = {}
function * gen(a, b, c) {
this // => ctx
return yield ['a', 'b', 'c']
}

consec.call(ctx, gen, 'a', 'b', 'c')
.then(function (abc) {
abc // => ['a', 'b', 'c']
})

// if an error is throwm then the chain ends there
var error = new Error()
consec(function * () {
throw error
}).catch(function (err) {
err // => error
})

// if a promise is rejected then the chain ends there
var error = new Error()
consec(function * () {
yield Promise.reject(error)

// this is never reached
return 'abc'
}).catch(function (err) {
err // => error
})

// a generator can also be yielded
function * g() {
return yield Promise.resolve('abc')
}
consec(function * () {
var a = yield * g()
t.equals(a, 'abc')
})

// finally you can even nest consec calls inside one another
function * g(abc) {
return yield Promise.resolve(abc)
}