26 lines
835 B
JavaScript
26 lines
835 B
JavaScript
function foo<T: number>(x: T): T {
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var _ = x * 1; // OK
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var y: string = x; // error
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return x; // OK
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}
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class C<T: number> {
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bar<U: number>(x: U): T {
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return x; // error, since T: number and U: number does not imply U: T
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}
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qux<U: T>(x: U): T {
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var _ = x * 1; // OK, since T: number and U: T implies U: number
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var y: string = x; // error
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return x; // OK, since U: T
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}
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}
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function example<T: {x: number}>(o: T): T { o.x = 0; return o; }
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var obj1: {x: number; y: string} = example({x: 0, y: ""});
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var obj2: {x: number} = example({x: 0});
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var c: C<string> = new C; // error, since T = string is incompatible with number
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var q: number = c.qux(0);
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/* 2 more errors, since argument U = number is incompatible with T = string, and
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* result T = string is incompatible with number */
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