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=== tests/cases/compiler/literalFreshnessPropagationOnNarrowing.ts ===
function f1() {
>f1 : Symbol(f1, Decl(literalFreshnessPropagationOnNarrowing.ts, 0, 0))
let b = true;
>b : Symbol(b, Decl(literalFreshnessPropagationOnNarrowing.ts, 1, 7))
let obj = { b };
>obj : Symbol(obj, Decl(literalFreshnessPropagationOnNarrowing.ts, 2, 7))
>b : Symbol(b, Decl(literalFreshnessPropagationOnNarrowing.ts, 2, 15))
// Desired: OK
// 3.0: OK
// 3.1 as-is: OK
// 3.1 minus widening propagation: error
obj.b = false;
>obj.b : Symbol(b, Decl(literalFreshnessPropagationOnNarrowing.ts, 2, 15))
>obj : Symbol(obj, Decl(literalFreshnessPropagationOnNarrowing.ts, 2, 7))
>b : Symbol(b, Decl(literalFreshnessPropagationOnNarrowing.ts, 2, 15))
}
function f2() {
>f2 : Symbol(f2, Decl(literalFreshnessPropagationOnNarrowing.ts, 8, 1))
type Element = (string | false);
>Element : Symbol(Element, Decl(literalFreshnessPropagationOnNarrowing.ts, 10, 15))
type ElementOrArray = Element | Element[];
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>Element : Symbol(Element, Decl(literalFreshnessPropagationOnNarrowing.ts, 10, 15))
>Element : Symbol(Element, Decl(literalFreshnessPropagationOnNarrowing.ts, 10, 15))
let el: Element = null as any;
>el : Symbol(el, Decl(literalFreshnessPropagationOnNarrowing.ts, 13, 7))
>Element : Symbol(Element, Decl(literalFreshnessPropagationOnNarrowing.ts, 10, 15))
let arr: Element[] = null as any;
>arr : Symbol(arr, Decl(literalFreshnessPropagationOnNarrowing.ts, 14, 7))
>Element : Symbol(Element, Decl(literalFreshnessPropagationOnNarrowing.ts, 10, 15))
let elOrA: ElementOrArray = null as any;
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
// Desired/actual: All OK
let a1: ElementOrArray = el;
>a1 : Symbol(a1, Decl(literalFreshnessPropagationOnNarrowing.ts, 18, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>el : Symbol(el, Decl(literalFreshnessPropagationOnNarrowing.ts, 13, 7))
let a2: ElementOrArray = arr;
>a2 : Symbol(a2, Decl(literalFreshnessPropagationOnNarrowing.ts, 19, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>arr : Symbol(arr, Decl(literalFreshnessPropagationOnNarrowing.ts, 14, 7))
let a3: ElementOrArray = [el];
>a3 : Symbol(a3, Decl(literalFreshnessPropagationOnNarrowing.ts, 20, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>el : Symbol(el, Decl(literalFreshnessPropagationOnNarrowing.ts, 13, 7))
let a4: ElementOrArray = Array.isArray(elOrA) ? elOrA : [elOrA];
>a4 : Symbol(a4, Decl(literalFreshnessPropagationOnNarrowing.ts, 21, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>Array.isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
// Desired: OK
// 3.0: Error
// 3.1: OK
let a5: ElementOrArray = [...Array.isArray(elOrA) ? elOrA : [elOrA]];
>a5 : Symbol(a5, Decl(literalFreshnessPropagationOnNarrowing.ts, 26, 7))
>ElementOrArray : Symbol(ElementOrArray, Decl(literalFreshnessPropagationOnNarrowing.ts, 11, 36))
>Array.isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
>elOrA : Symbol(elOrA, Decl(literalFreshnessPropagationOnNarrowing.ts, 15, 7))
}
function f3() {
>f3 : Symbol(f3, Decl(literalFreshnessPropagationOnNarrowing.ts, 27, 1))
type XY = 'x' | 'y';
>XY : Symbol(XY, Decl(literalFreshnessPropagationOnNarrowing.ts, 29, 15))
const x: XY = 'x';
>x : Symbol(x, Decl(literalFreshnessPropagationOnNarrowing.ts, 31, 9))
>XY : Symbol(XY, Decl(literalFreshnessPropagationOnNarrowing.ts, 29, 15))
let x2 = x;
>x2 : Symbol(x2, Decl(literalFreshnessPropagationOnNarrowing.ts, 32, 7))
>x : Symbol(x, Decl(literalFreshnessPropagationOnNarrowing.ts, 31, 9))
// Desired: OK (up for debate?)
// 3.0: Error
// 3.1 as-is: OK
x2 = 'y';
>x2 : Symbol(x2, Decl(literalFreshnessPropagationOnNarrowing.ts, 32, 7))
// Desired/actual: All OK
let x3: XY = x;
>x3 : Symbol(x3, Decl(literalFreshnessPropagationOnNarrowing.ts, 39, 7))
>XY : Symbol(XY, Decl(literalFreshnessPropagationOnNarrowing.ts, 29, 15))
>x : Symbol(x, Decl(literalFreshnessPropagationOnNarrowing.ts, 31, 9))
x3 = 'y';
>x3 : Symbol(x3, Decl(literalFreshnessPropagationOnNarrowing.ts, 39, 7))
}
function f4() {
>f4 : Symbol(f4, Decl(literalFreshnessPropagationOnNarrowing.ts, 41, 1))
const x: boolean = true;
>x : Symbol(x, Decl(literalFreshnessPropagationOnNarrowing.ts, 44, 9))
let x1 = x;
>x1 : Symbol(x1, Decl(literalFreshnessPropagationOnNarrowing.ts, 45, 7))
>x : Symbol(x, Decl(literalFreshnessPropagationOnNarrowing.ts, 44, 9))
// Desired: OK
// 3.0: OK
// 3.1: OK
// 3.1 minus widening propagation: error
x1 = false;
>x1 : Symbol(x1, Decl(literalFreshnessPropagationOnNarrowing.ts, 45, 7))
}
function f5() {
>f5 : Symbol(f5, Decl(literalFreshnessPropagationOnNarrowing.ts, 51, 1))
type XY = 'x' | 'y';
>XY : Symbol(XY, Decl(literalFreshnessPropagationOnNarrowing.ts, 53, 15))
let arr: XY[] = ['x'];
>arr : Symbol(arr, Decl(literalFreshnessPropagationOnNarrowing.ts, 55, 7))
>XY : Symbol(XY, Decl(literalFreshnessPropagationOnNarrowing.ts, 53, 15))
arr = ['y'];
>arr : Symbol(arr, Decl(literalFreshnessPropagationOnNarrowing.ts, 55, 7))
// Desired: OK
// Error in all extant branches
arr = [...['y']];
>arr : Symbol(arr, Decl(literalFreshnessPropagationOnNarrowing.ts, 55, 7))
}
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