emit error on destructuring of rest property

src/compiler/checker.ts

@@ -30413,6 +30413,13 @@ namespace ts {
 
             for (const prop of node.properties) {
                 if (prop.kind === SyntaxKind.SpreadAssignment) {
+                    if (inDestructuring) {
+                        // a rest property cannot be destructured any further
+                        const expression = skipParentheses(prop.expression);
+                        if (isArrayLiteralExpression(expression) || isObjectLiteralExpression(expression)) {
+                            return grammarErrorOnNode(prop.expression, Diagnostics.A_rest_element_cannot_contain_a_binding_pattern);
+                        }
+                    }
                     continue;
                 }
                 const name = prop.name;

tests/baselines/reference/restPropertyWithBindingPattern.errors.txt

@@ -0,0 +1,28 @@
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(1,6): error TS2501: A rest element cannot contain a binding pattern.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(2,6): error TS2501: A rest element cannot contain a binding pattern.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(2,6): error TS2701: The target of an object rest assignment must be a variable or a property access.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(3,6): error TS2461: Type '{}' is not an array type.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(3,6): error TS2501: A rest element cannot contain a binding pattern.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(4,6): error TS2501: A rest element cannot contain a binding pattern.
+tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts(4,6): error TS2701: The target of an object rest assignment must be a variable or a property access.
+
+
+==== tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts (7 errors) ====
+    ({...{}} = {});
+         ~~
+!!! error TS2501: A rest element cannot contain a binding pattern.
+    ({...({})} = {});
+         ~~~~
+!!! error TS2501: A rest element cannot contain a binding pattern.
+         ~~~~
+!!! error TS2701: The target of an object rest assignment must be a variable or a property access.
+    ({...[]} = {});
+         ~~
+!!! error TS2461: Type '{}' is not an array type.
+         ~~
+!!! error TS2501: A rest element cannot contain a binding pattern.
+    ({...([])} = {});
+         ~~~~
+!!! error TS2501: A rest element cannot contain a binding pattern.
+         ~~~~
+!!! error TS2701: The target of an object rest assignment must be a variable or a property access.

tests/baselines/reference/restPropertyWithBindingPattern.js

@@ -0,0 +1,21 @@
+//// [restPropertyWithBindingPattern.ts]
+({...{}} = {});
+({...({})} = {});
+({...[]} = {});
+({...([])} = {});
+
+//// [restPropertyWithBindingPattern.js]
+var __rest = (this && this.__rest) || function (s, e) {
+    var t = {};
+    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
+        t[p] = s[p];
+    if (s != null && typeof Object.getOwnPropertySymbols === "function")
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
+            t[p[i]] = s[p[i]];
+    return t;
+};
+var _a, _b;
+(_a = __rest({}, []));
+(({}) = __rest({}, []));
+(_b = __rest({}, []));
+(([]) = __rest({}, []));

tests/baselines/reference/restPropertyWithBindingPattern.symbols

@@ -0,0 +1,6 @@
+=== tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts ===
+({...{}} = {});
+No type information for this code.({...({})} = {});
+No type information for this code.({...[]} = {});
+No type information for this code.({...([])} = {});
+No type information for this code.

tests/baselines/reference/restPropertyWithBindingPattern.types

@@ -0,0 +1,31 @@
+=== tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts ===
+({...{}} = {});
+>({...{}} = {}) : {}
+>{...{}} = {} : {}
+>{...{}} : {}
+>{} : {}
+>{} : {}
+
+({...({})} = {});
+>({...({})} = {}) : {}
+>{...({})} = {} : {}
+>{...({})} : {}
+>({}) : {}
+>{} : {}
+>{} : {}
+
+({...[]} = {});
+>({...[]} = {}) : {}
+>{...[]} = {} : {}
+>{...[]} : { [n: number]: undefined; length: number; toString(): string; toLocaleString(): string; pop(): undefined; push(...items: undefined[]): number; concat(...items: ConcatArray<undefined>[]): undefined[]; concat(...items: ConcatArray<undefined>[]): undefined[]; join(separator?: string): string; reverse(): undefined[]; shift(): undefined; slice(start?: number, end?: number): undefined[]; sort(compareFn?: (a: undefined, b: undefined) => number): undefined[]; splice(start: number, deleteCount?: number): undefined[]; splice(start: number, deleteCount: number, ...items: undefined[]): undefined[]; unshift(...items: undefined[]): number; indexOf(searchElement: undefined, fromIndex?: number): number; lastIndexOf(searchElement: undefined, fromIndex?: number): number; every(callbackfn: (value: undefined, index: number, array: undefined[]) => boolean, thisArg?: any): boolean; some(callbackfn: (value: undefined, index: number, array: undefined[]) => boolean, thisArg?: any): boolean; forEach(callbackfn: (value: undefined, index: number, array: undefined[]) => void, thisArg?: any): void; map<U>(callbackfn: (value: undefined, index: number, array: undefined[]) => U, thisArg?: any): U[]; filter<S extends undefined>(callbackfn: (value: undefined, index: number, array: undefined[]) => value is S, thisArg?: any): S[]; filter(callbackfn: (value: undefined, index: number, array: undefined[]) => any, thisArg?: any): undefined[]; reduce(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined): undefined; reduce(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined, initialValue: undefined): undefined; reduce<U>(callbackfn: (previousValue: U, currentValue: undefined, currentIndex: number, array: undefined[]) => U, initialValue: U): U; reduceRight(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined): undefined; reduceRight(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined, initialValue: undefined): undefined; reduceRight<U>(callbackfn: (previousValue: U, currentValue: undefined, currentIndex: number, array: undefined[]) => U, initialValue: U): U; }
+>[] : undefined[]
+>{} : {}
+
+({...([])} = {});
+>({...([])} = {}) : {}
+>{...([])} = {} : {}
+>{...([])} : { [n: number]: undefined; length: number; toString(): string; toLocaleString(): string; pop(): undefined; push(...items: undefined[]): number; concat(...items: ConcatArray<undefined>[]): undefined[]; concat(...items: ConcatArray<undefined>[]): undefined[]; join(separator?: string): string; reverse(): undefined[]; shift(): undefined; slice(start?: number, end?: number): undefined[]; sort(compareFn?: (a: undefined, b: undefined) => number): undefined[]; splice(start: number, deleteCount?: number): undefined[]; splice(start: number, deleteCount: number, ...items: undefined[]): undefined[]; unshift(...items: undefined[]): number; indexOf(searchElement: undefined, fromIndex?: number): number; lastIndexOf(searchElement: undefined, fromIndex?: number): number; every(callbackfn: (value: undefined, index: number, array: undefined[]) => boolean, thisArg?: any): boolean; some(callbackfn: (value: undefined, index: number, array: undefined[]) => boolean, thisArg?: any): boolean; forEach(callbackfn: (value: undefined, index: number, array: undefined[]) => void, thisArg?: any): void; map<U>(callbackfn: (value: undefined, index: number, array: undefined[]) => U, thisArg?: any): U[]; filter<S extends undefined>(callbackfn: (value: undefined, index: number, array: undefined[]) => value is S, thisArg?: any): S[]; filter(callbackfn: (value: undefined, index: number, array: undefined[]) => any, thisArg?: any): undefined[]; reduce(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined): undefined; reduce(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined, initialValue: undefined): undefined; reduce<U>(callbackfn: (previousValue: U, currentValue: undefined, currentIndex: number, array: undefined[]) => U, initialValue: U): U; reduceRight(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined): undefined; reduceRight(callbackfn: (previousValue: undefined, currentValue: undefined, currentIndex: number, array: undefined[]) => undefined, initialValue: undefined): undefined; reduceRight<U>(callbackfn: (previousValue: U, currentValue: undefined, currentIndex: number, array: undefined[]) => U, initialValue: U): U; }
+>([]) : undefined[]
+>[] : undefined[]
+>{} : {}
+

tests/cases/conformance/es6/destructuring/restPropertyWithBindingPattern.ts

@@ -0,0 +1,4 @@
+({...{}} = {});
+({...({})} = {});
+({...[]} = {});
+({...([])} = {});