194 lines
4.1 KiB
TypeScript
194 lines
4.1 KiB
TypeScript
// @strictNullChecks: true
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// @declaration: true
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function f1<T>(x: T, k: keyof T) {
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return x[k];
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}
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function f2<T, K extends keyof T>(x: T, k: K) {
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return x[k];
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}
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function f3<T, U extends T>(x: T, y: U, k: keyof T) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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function f4<T, U extends T, K extends keyof T>(x: T, y: U, k: K) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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function f5<T, U extends T>(x: T, y: U, k: keyof U) {
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x[k] = y[k]; // Error
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y[k] = x[k]; // Error
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}
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function f6<T, U extends T, K extends keyof U>(x: T, y: U, k: K) {
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x[k] = y[k]; // Error
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y[k] = x[k]; // Error
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}
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function f10<T>(x: T, y: Partial<T>, k: keyof T) {
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x[k] = y[k]; // Error
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y[k] = x[k];
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}
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function f11<T, K extends keyof T>(x: T, y: Partial<T>, k: K) {
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x[k] = y[k]; // Error
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y[k] = x[k];
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}
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function f12<T, U extends T>(x: T, y: Partial<U>, k: keyof T) {
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x[k] = y[k]; // Error
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y[k] = x[k]; // Error
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}
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function f13<T, U extends T, K extends keyof T>(x: T, y: Partial<U>, k: K) {
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x[k] = y[k]; // Error
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y[k] = x[k]; // Error
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}
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function f20<T>(x: T, y: Readonly<T>, k: keyof T) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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function f21<T, K extends keyof T>(x: T, y: Readonly<T>, k: K) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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function f22<T, U extends T>(x: T, y: Readonly<U>, k: keyof T) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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function f23<T, U extends T, K extends keyof T>(x: T, y: Readonly<U>, k: K) {
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x[k] = y[k];
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y[k] = x[k]; // Error
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}
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type Thing = { a: string, b: string };
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function f30<T>(x: T, y: Partial<T>) {
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x = y; // Error
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y = x;
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}
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function f31<T extends Thing>(x: Partial<Thing>, y: Partial<T>) {
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x = y;
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y = x; // Error
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}
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function f40<T>(x: T, y: Readonly<T>) {
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x = y;
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y = x;
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}
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function f41<T extends Thing>(x: Readonly<Thing>, y: Readonly<T>) {
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x = y;
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y = x; // Error
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}
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type Item = {
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name: string;
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}
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type ItemMap = {
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[x: string]: Item;
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}
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function f50<T extends ItemMap>(obj: T, key: keyof T) {
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let item: Item = obj[key];
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return obj[key].name;
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}
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function f51<T extends ItemMap, K extends keyof T>(obj: T, key: K) {
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let item: Item = obj[key];
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return obj[key].name;
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}
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type T1<T> = {
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[P in keyof T]: T[P];
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}
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type T2<T> = {
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[P in keyof T]: T[P];
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}
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function f60<U>(x: T1<U>, y: T2<U>) {
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x = y;
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y = x;
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}
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type Identity<T> = {
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[P in keyof T]: T[P];
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}
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function f61<U>(x: Identity<U>, y: Partial<U>) {
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x = y; // Error
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y = x;
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}
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function f62<U>(x: Identity<U>, y: Readonly<U>) {
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x = y;
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y = x;
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}
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function f70<T>(x: { [P in keyof T]: T[P] }, y: { [P in keyof T]: T[P] }) {
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x = y;
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y = x;
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}
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function f71<T, U extends T>(x: { [P in keyof T]: T[P] }, y: { [P in keyof T]: U[P] }) {
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x = y;
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y = x; // Error
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}
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function f72<T, U extends T>(x: { [P in keyof T]: T[P] }, y: { [P in keyof U]: U[P] }) {
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x = y;
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y = x; // Error
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}
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function f73<T, K extends keyof T>(x: { [P in K]: T[P] }, y: { [P in keyof T]: T[P] }) {
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x = y;
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y = x; // Error
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}
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function f74<T, U extends T, K extends keyof T>(x: { [P in K]: T[P] }, y: { [P in keyof U]: U[P] }) {
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x = y;
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y = x; // Error
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}
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function f75<T, U extends T, K extends keyof T>(x: { [P in K]: T[P] }, y: { [P in keyof T]: U[P] }) {
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x = y;
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y = x; // Error
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}
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function f76<T, U extends T, K extends keyof T>(x: { [P in K]: T[P] }, y: { [P in K]: U[P] }) {
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x = y;
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y = x; // Error
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}
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function f80<T>(t: T): Partial<T> {
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return t;
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}
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function f81<T, K extends keyof T>(t: T, k: K): Partial<T[K]> {
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return t[k];
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}
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function f82<T, K1 extends keyof T, K2 extends keyof T[K1]>(t: T, k1: K1, k2: K2): Partial<T[K1][K2]> {
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return t[k1][k2];
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}
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// #31070
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type Numeric<T> = { [K in keyof T]?: number };
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function f90<T extends { x: number }>() {
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const n: Numeric<T> = { x: 1 };
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}
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function f<T extends { x: {} }>(): Partial<T> {
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return undefined! as T;
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}
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