declare function use(x: any): any;

//==== let
for (let x in {}) {
    (function() { return x});
    (() => x);
}

for (let x of []) {
    (function() { return x});
    (() => x);
}

for (let x = 0; x < 1; ++x) {
    (function() { return x});
    (() => x);
}

while (1 === 1) {
    let x;
    (function() { return x});
    (() => x);
}

do {
    let x;
    (function() { return x});
    (() => x);
} while (1 === 1)

for (let y = 0; y < 1; ++y) {
    let x = 1;
    (function() { return x});
    (() => x);
}

for (let x = 0, y = 1; x < 1; ++x) {
    (function() { return x + y});
    (() => x + y);
}

while (1 === 1) {
    let x, y;
    (function() { return x + y});
    (() => x + y);
}

do {
    let x, y;
    (function() { return x + y});
    (() => x + y);
} while (1 === 1)

for (let y = 0; y < 1; ++y) {
    let x = 1;
    (function() { return x + y});
    (() => x + y);
}

for (let y = (use(() => y), 0); y < 1; ++y) {
}

for (let y = 0; use(() => y), y < 1; ++y) {
}

for (let y = 0; y < 1; use(() => y), ++y) {
}

for (let y = (use(() => y), 0); use(() => y), y < 1; use(() => y), ++y) {
    use(() => y);
}

//=========const
for (const x in {}) {
    (function() { return x});
    (() => x);
}

for (const x of []) {
    (function() { return x});
    (() => x);
}

for (const x = 0; x < 1;) {
    (function() { return x});
    (() => x);
}

while (1 === 1) {
    const x = 1;
    (function() { return x});
    (() => x);
}

do {
    const x = 1;
    (function() { return x});
    (() => x);
} while (1 === 1)

for (const y = 0; y < 1;) {
    const x = 1;
    (function() { return x});
    (() => x);
}

for (const x = 0, y = 1; x < 1;) {
    (function() { return x + y});
    (() => x + y);
}

while (1 === 1) {
    const x = 1, y = 1;
    (function() { return x + y});
    (() => x + y);
}

do {
    const x = 1, y = 1;
    (function() { return x + y});
    (() => x + y);
} while (1 === 1)

for (const y = 0; y < 1;) {
    const x = 1;
    (function() { return x + y});
    (() => x + y);
}

// https://github.com/Microsoft/TypeScript/issues/20594
declare const sobj: { [x: string]: any };
for (let sx in sobj) {
    (() => sobj[sx]);
}
declare const iobj: { [x: number]: any };
for (let ix in iobj) {
    (() => iobj[ix]);
}