Add tests

tests/cases/conformance/expressions/typeAssertions/constAssertions.ts

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