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‎tests/baselines/reference/constAssertions.errors.txt

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tests/cases/conformance/expressions/typeAssertions/constAssertions.ts(44,32): error TS2540: Cannot assign to 'x' because it is a read-only property.
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tests/cases/conformance/expressions/typeAssertions/constAssertions.ts(61,10): error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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tests/cases/conformance/expressions/typeAssertions/constAssertions.ts(62,10): error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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tests/cases/conformance/expressions/typeAssertions/constAssertions.ts(63,10): error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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==== tests/cases/conformance/expressions/typeAssertions/constAssertions.ts (4 errors) ====
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let v1 = 'abc' as const;
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let v2 = `abc` as const;
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let v3 = 10 as const;
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let v4 = -10 as const;
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let v5 = +10 as const;
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let v6 = 10n as const;
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let v7 = -10n as const;
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let v8 = true as const;
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let v9 = false as const;
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let c1 = 'abc' as const;
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let c2 = `abc` as const;
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let c3 = 10 as const;
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let c4 = -10 as const;
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let c5 = +10 as const;
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let c6 = 10n as const;
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let c7 = -10n as const;
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let c8 = true as const;
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let c9 = false as const;
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let vv1 = v1;
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let vc1 = c1;
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let a1 = [] as const;
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let a2 = [1, 2, 3] as const;
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let a3 = [10, 'hello', true] as const;
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let a4 = [...[1, 2, 3]] as const;
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let a5 = [1, 2, 3];
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let a6 = [...a5] as const;
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let a7 = [...a6];
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let a8 = ['abc', ...a7] as const;
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let a9 = [...a8];
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declare let d: { [x: string]: string };
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let o1 = { x: 10, y: 20 } as const;
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let o2 = { a: 1, 'b': 2, ['c']: 3, d() {}, ['e' + '']: 4 } as const;
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let o3 = { ...o1, ...o2 } as const;
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let o4 = { a: 1, b: 2 };
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let o5 = { ...o4 } as const;
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let o6 = { ...o5 };
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let o7 = { ...d } as const;
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let o8 = { ...o7 };
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let o9 = { x: 10, foo() { this.x = 20 } } as const; // Error
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~
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!!! error TS2540: Cannot assign to 'x' because it is a read-only property.
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let p1 = (10) as const;
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let p2 = ((-10)) as const;
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let p3 = ([(10)]) as const;
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let p4 = [[[[10]]]] as const;
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let x1 = { x: 10, y: [20, 30], z: { a: { b: 42 } } } as const;
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let q1 = <const> 10;
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let q2 = <const> 'abc';
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let q3 = <const> true;
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let q4 = <const> [1, 2, 3];
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let q5 = <const> { x: 10, y: 20 };
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declare function id<T>(x: T): T;
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let e1 = v1 as const; // Error
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~~
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!!! error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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let e2 = (true ? 1 : 0) as const; // Error
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~~~~~~~~~~~~~~
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!!! error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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let e3 = id(1) as const; // Error
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~~~~~
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!!! error TS1355: A 'const' assertion can only be applied to a string, number, boolean, array, or object literal.
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‎tests/baselines/reference/constAssertions.js

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//// [constAssertions.ts]
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let v1 = 'abc' as const;
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let v2 = `abc` as const;
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let v3 = 10 as const;
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let v4 = -10 as const;
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let v5 = +10 as const;
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let v6 = 10n as const;
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let v7 = -10n as const;
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let v8 = true as const;
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let v9 = false as const;
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let c1 = 'abc' as const;
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let c2 = `abc` as const;
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let c3 = 10 as const;
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let c4 = -10 as const;
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let c5 = +10 as const;
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let c6 = 10n as const;
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let c7 = -10n as const;
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let c8 = true as const;
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let c9 = false as const;
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let vv1 = v1;
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let vc1 = c1;
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let a1 = [] as const;
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let a2 = [1, 2, 3] as const;
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let a3 = [10, 'hello', true] as const;
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let a4 = [...[1, 2, 3]] as const;
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let a5 = [1, 2, 3];
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let a6 = [...a5] as const;
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let a7 = [...a6];
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let a8 = ['abc', ...a7] as const;
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let a9 = [...a8];
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declare let d: { [x: string]: string };
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let o1 = { x: 10, y: 20 } as const;
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let o2 = { a: 1, 'b': 2, ['c']: 3, d() {}, ['e' + '']: 4 } as const;
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let o3 = { ...o1, ...o2 } as const;
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let o4 = { a: 1, b: 2 };
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let o5 = { ...o4 } as const;
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let o6 = { ...o5 };
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let o7 = { ...d } as const;
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let o8 = { ...o7 };
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let o9 = { x: 10, foo() { this.x = 20 } } as const; // Error
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let p1 = (10) as const;
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let p2 = ((-10)) as const;
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let p3 = ([(10)]) as const;
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let p4 = [[[[10]]]] as const;
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let x1 = { x: 10, y: [20, 30], z: { a: { b: 42 } } } as const;
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let q1 = <const> 10;
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let q2 = <const> 'abc';
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let q3 = <const> true;
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let q4 = <const> [1, 2, 3];
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let q5 = <const> { x: 10, y: 20 };
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declare function id<T>(x: T): T;
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let e1 = v1 as const; // Error
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let e2 = (true ? 1 : 0) as const; // Error
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let e3 = id(1) as const; // Error
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//// [constAssertions.js]
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"use strict";
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let v1 = 'abc';
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let v2 = `abc`;
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let v3 = 10;
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let v4 = -10;
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let v5 = +10;
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let v6 = 10n;
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let v7 = -10n;
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let v8 = true;
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let v9 = false;
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let c1 = 'abc';
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let c2 = `abc`;
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let c3 = 10;
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let c4 = -10;
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let c5 = +10;
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let c6 = 10n;
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let c7 = -10n;
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let c8 = true;
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let c9 = false;
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let vv1 = v1;
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let vc1 = c1;
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let a1 = [];
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let a2 = [1, 2, 3];
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let a3 = [10, 'hello', true];
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let a4 = [...[1, 2, 3]];
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let a5 = [1, 2, 3];
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let a6 = [...a5];
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let a7 = [...a6];
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let a8 = ['abc', ...a7];
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let a9 = [...a8];
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let o1 = { x: 10, y: 20 };
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let o2 = { a: 1, 'b': 2, ['c']: 3, d() { }, ['e' + '']: 4 };
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let o3 = { ...o1, ...o2 };
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let o4 = { a: 1, b: 2 };
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let o5 = { ...o4 };
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let o6 = { ...o5 };
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let o7 = { ...d };
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let o8 = { ...o7 };
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let o9 = { x: 10, foo() { this.x = 20; } }; // Error
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let p1 = (10);
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let p2 = ((-10));
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let p3 = ([(10)]);
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let p4 = [[[[10]]]];
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let x1 = { x: 10, y: [20, 30], z: { a: { b: 42 } } };
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let q1 = 10;
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let q2 = 'abc';
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let q3 = true;
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let q4 = [1, 2, 3];
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let q5 = { x: 10, y: 20 };
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let e1 = v1; // Error
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let e2 = (true ? 1 : 0); // Error
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let e3 = id(1); // Error
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//// [constAssertions.d.ts]
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declare let v1: "abc";
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declare let v2: "abc";
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declare let v3: 10;
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declare let v4: -10;
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declare let v5: 10;
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declare let v6: 10n;
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declare let v7: -10n;
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declare let v8: true;
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declare let v9: false;
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declare let c1: "abc";
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declare let c2: "abc";
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declare let c3: 10;
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declare let c4: -10;
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declare let c5: 10;
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declare let c6: 10n;
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declare let c7: -10n;
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declare let c8: true;
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declare let c9: false;
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declare let vv1: "abc";
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declare let vc1: "abc";
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declare let a1: readonly [];
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declare let a2: readonly [1, 2, 3];
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declare let a3: readonly [10, "hello", true];
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declare let a4: readonly (1 | 2 | 3)[];
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declare let a5: number[];
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declare let a6: readonly number[];
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declare let a7: number[];
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declare let a8: readonly ["abc", ...number[]];
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declare let a9: (number | "abc")[];
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declare let d: {
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[x: string]: string;
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};
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declare let o1: {
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readonly x: 10;
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readonly y: 20;
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};
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declare let o2: {
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readonly [x: string]: 1 | 2 | 3 | (() => void) | 4;
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readonly a: 1;
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readonly 'b': 2;
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readonly ['c']: 3;
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readonly d: () => void;
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};
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declare let o3: {
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readonly a: 1;
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readonly 'b': 2;
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readonly ['c']: 3;
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readonly d: () => void;
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readonly x: 10;
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readonly y: 20;
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};
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declare let o4: {
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a: number;
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b: number;
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};
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declare let o5: {
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readonly a: number;
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readonly b: number;
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};
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declare let o6: {
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a: number;
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b: number;
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};
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declare let o7: {
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readonly [x: string]: string;
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};
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declare let o8: {
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[x: string]: string;
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};
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declare let o9: {
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readonly x: 10;
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readonly foo: () => void;
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};
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declare let p1: 10;
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declare let p2: -10;
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declare let p3: readonly [10];
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declare let p4: readonly [readonly [readonly [readonly [10]]]];
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declare let x1: {
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readonly x: 10;
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readonly y: readonly [20, 30];
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z: {
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a: {
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readonly b: 42;
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};
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};
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};
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declare let q1: 10;
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declare let q2: "abc";
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declare let q3: true;
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declare let q4: readonly [1, 2, 3];
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declare let q5: {
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readonly x: 10;
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readonly y: 20;
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};
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declare function id<T>(x: T): T;
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declare let e1: "abc";
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declare let e2: 0 | 1;
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declare let e3: 1;

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