flow/tests/forof/forof.js at v0.29 · dominictobias/flow

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/**

* @flow

function testArray(arr: Array<number>): void {

for (var x of arr) {

(x: string); // Error - number ~> string

}

function testIterable1(iterable: Iterable<number>): void {

for (var x of iterable) {

(x: string); // Error - number ~> string

}

function testIterable2(iterable: Iterable<*>): void {

for (var x of iterable) {

(x: string);

}

function testString(str: string): void {

for (var x of str) {

(x: number); // Error - string ~> number

}

function testMap1(map: Map<string, number>): void {

for (var elem of map) {

(elem: [string, number]);

(elem: number); // Error - tuple ~> number

}

function testMap2(map: Map<*, *>): void {

for (var elem of map) {

(elem: [number, string]); // Any tuple is fine

(elem: number); // Error - tuple ~> number

}

function testSet1(set: Set<string>): void {

for (var x of set) {

(x: number); // Error - string ~> number

}

function testSet2(set: Set<*>): void {

for (var x of set) {

(x: number); // Anything goes

}