=== tests/cases/compiler/intersectionsAndOptionalProperties.ts ===
declare let x: { a?: number, b: string };
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 0, 11))
>a : Symbol(a, Decl(intersectionsAndOptionalProperties.ts, 0, 16))
>b : Symbol(b, Decl(intersectionsAndOptionalProperties.ts, 0, 28))

declare let y: { a: null, b: string };
>y : Symbol(y, Decl(intersectionsAndOptionalProperties.ts, 1, 11))
>a : Symbol(a, Decl(intersectionsAndOptionalProperties.ts, 1, 16))
>b : Symbol(b, Decl(intersectionsAndOptionalProperties.ts, 1, 25))

declare let z: { a: null } & { b: string };
>z : Symbol(z, Decl(intersectionsAndOptionalProperties.ts, 2, 11))
>a : Symbol(a, Decl(intersectionsAndOptionalProperties.ts, 2, 16))
>b : Symbol(b, Decl(intersectionsAndOptionalProperties.ts, 2, 30))

x = y;  // Error
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 0, 11))
>y : Symbol(y, Decl(intersectionsAndOptionalProperties.ts, 1, 11))

x = z;  // Error
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 0, 11))
>z : Symbol(z, Decl(intersectionsAndOptionalProperties.ts, 2, 11))

// Repro from #36604

interface To {
>To : Symbol(To, Decl(intersectionsAndOptionalProperties.ts, 5, 6))

    field?: number;
>field : Symbol(To.field, Decl(intersectionsAndOptionalProperties.ts, 9, 14))

    anotherField: string;
>anotherField : Symbol(To.anotherField, Decl(intersectionsAndOptionalProperties.ts, 10, 19))
}

type From =  { field: null } & Omit<To, 'field'>;
>From : Symbol(From, Decl(intersectionsAndOptionalProperties.ts, 12, 1))
>field : Symbol(field, Decl(intersectionsAndOptionalProperties.ts, 14, 14))
>Omit : Symbol(Omit, Decl(lib.es5.d.ts, --, --))
>To : Symbol(To, Decl(intersectionsAndOptionalProperties.ts, 5, 6))

function foo(v: From) {
>foo : Symbol(foo, Decl(intersectionsAndOptionalProperties.ts, 14, 49))
>v : Symbol(v, Decl(intersectionsAndOptionalProperties.ts, 16, 13))
>From : Symbol(From, Decl(intersectionsAndOptionalProperties.ts, 12, 1))

    let x: To;
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 17, 7))
>To : Symbol(To, Decl(intersectionsAndOptionalProperties.ts, 5, 6))

    x = v;  // Error
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 17, 7))
>v : Symbol(v, Decl(intersectionsAndOptionalProperties.ts, 16, 13))

    x.field = v.field; // Error
>x.field : Symbol(To.field, Decl(intersectionsAndOptionalProperties.ts, 9, 14))
>x : Symbol(x, Decl(intersectionsAndOptionalProperties.ts, 17, 7))
>field : Symbol(To.field, Decl(intersectionsAndOptionalProperties.ts, 9, 14))
>v.field : Symbol(field, Decl(intersectionsAndOptionalProperties.ts, 14, 14))
>v : Symbol(v, Decl(intersectionsAndOptionalProperties.ts, 16, 13))
>field : Symbol(field, Decl(intersectionsAndOptionalProperties.ts, 14, 14))
}

// Repro from #38348

const yy: number[] & [number, ...number[]] = [1];
>yy : Symbol(yy, Decl(intersectionsAndOptionalProperties.ts, 24, 5))

const xx: [number, ...number[]] = yy;
>xx : Symbol(xx, Decl(intersectionsAndOptionalProperties.ts, 25, 5))
>yy : Symbol(yy, Decl(intersectionsAndOptionalProperties.ts, 24, 5))