=== tests/cases/compiler/genericSpecializations1.ts ===
interface IFoo<T> {
>IFoo : IFoo<T>, Symbol(IFoo, Decl(genericSpecializations1.ts, 0, 0))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 0, 15))

    foo<T>(x: T): T; // no error on implementors because IFoo's T is different from foo's T
>foo : <T>(x: T) => T, Symbol(foo, Decl(genericSpecializations1.ts, 0, 19))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 1, 8))
>x : T, Symbol(x, Decl(genericSpecializations1.ts, 1, 11))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 1, 8))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 1, 8))
}

class IntFooBad implements IFoo<number> {
>IntFooBad : IntFooBad, Symbol(IntFooBad, Decl(genericSpecializations1.ts, 2, 1))
>IFoo : IFoo<T>, Symbol(IFoo, Decl(genericSpecializations1.ts, 0, 0))

    foo(x: string): string { return null; }
>foo : (x: string) => string, Symbol(foo, Decl(genericSpecializations1.ts, 4, 41))
>x : string, Symbol(x, Decl(genericSpecializations1.ts, 5, 8))
>null : null
}

class StringFoo2 implements IFoo<string> {
>StringFoo2 : StringFoo2, Symbol(StringFoo2, Decl(genericSpecializations1.ts, 6, 1))
>IFoo : IFoo<T>, Symbol(IFoo, Decl(genericSpecializations1.ts, 0, 0))

    foo(x: string): string { return null; }
>foo : (x: string) => string, Symbol(foo, Decl(genericSpecializations1.ts, 8, 42))
>x : string, Symbol(x, Decl(genericSpecializations1.ts, 9, 8))
>null : null
}

class StringFoo3 implements IFoo<string> {
>StringFoo3 : StringFoo3, Symbol(StringFoo3, Decl(genericSpecializations1.ts, 10, 1))
>IFoo : IFoo<T>, Symbol(IFoo, Decl(genericSpecializations1.ts, 0, 0))

    foo<T>(x: T): T { return null; }
>foo : <T>(x: T) => T, Symbol(foo, Decl(genericSpecializations1.ts, 12, 42))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 13, 8))
>x : T, Symbol(x, Decl(genericSpecializations1.ts, 13, 11))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 13, 8))
>T : T, Symbol(T, Decl(genericSpecializations1.ts, 13, 8))
>null : null
}