=== tests/cases/compiler/contextualSignatureInstantiation2.ts ===
// dot f g x = f(g(x))
var dot: <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (_: U) => S;
>dot : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (_: U) => S
>T : T
>S : S
>f : (_: T) => S
>_ : T
>T : T
>S : S
>U : U
>g : (_: U) => T
>_ : U
>U : U
>T : T
>_ : U
>U : U
>S : S

dot = <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T): (r:U) => S => (x) => f(g(x));
>dot = <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T): (r:U) => S => (x) => f(g(x)) : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (r: U) => S
>dot : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (_: U) => S
><T, S>(f: (_: T) => S) => <U>(g: (_: U) => T): (r:U) => S => (x) => f(g(x)) : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (r: U) => S
>T : T
>S : S
>f : (_: T) => S
>_ : T
>T : T
>S : S
><U>(g: (_: U) => T): (r:U) => S => (x) => f(g(x)) : <U>(g: (_: U) => T) => (r: U) => S
>U : U
>g : (_: U) => T
>_ : U
>U : U
>T : T
>r : U
>U : U
>S : S
>(x) => f(g(x)) : (x: U) => S
>x : U
>f(g(x)) : S
>f : (_: T) => S
>g(x) : T
>g : (_: U) => T
>x : U

var id: <T>(x:T) => T;
>id : <T>(x: T) => T
>T : T
>x : T
>T : T
>T : T

var r23 = dot(id)(id);
>r23 : (_: {}) => {}
>dot(id)(id) : (_: {}) => {}
>dot(id) : <U>(g: (_: U) => {}) => (_: U) => {}
>dot : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (_: U) => S
>id : <T>(x: T) => T
>id : <T>(x: T) => T