=== 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, Symbol(dot, Decl(contextualSignatureInstantiation2.ts, 1, 3))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 1, 10))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 1, 12))
>f : (_: T) => S, Symbol(f, Decl(contextualSignatureInstantiation2.ts, 1, 16))
>_ : T, Symbol(_, Decl(contextualSignatureInstantiation2.ts, 1, 20))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 1, 10))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 1, 12))
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 1, 36))
>g : (_: U) => T, Symbol(g, Decl(contextualSignatureInstantiation2.ts, 1, 39))
>_ : U, Symbol(_, Decl(contextualSignatureInstantiation2.ts, 1, 43))
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 1, 36))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 1, 10))
>_ : U, Symbol(_, Decl(contextualSignatureInstantiation2.ts, 1, 59))
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 1, 36))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 1, 12))

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, Symbol(dot, Decl(contextualSignatureInstantiation2.ts, 1, 3))
><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, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 2, 7))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 2, 9))
>f : (_: T) => S, Symbol(f, Decl(contextualSignatureInstantiation2.ts, 2, 13))
>_ : T, Symbol(_, Decl(contextualSignatureInstantiation2.ts, 2, 17))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 2, 7))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 2, 9))
><U>(g: (_: U) => T): (r:U) => S => (x) => f(g(x)) : <U>(g: (_: U) => T) => (r: U) => S
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 2, 33))
>g : (_: U) => T, Symbol(g, Decl(contextualSignatureInstantiation2.ts, 2, 36))
>_ : U, Symbol(_, Decl(contextualSignatureInstantiation2.ts, 2, 40))
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 2, 33))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 2, 7))
>r : U, Symbol(r, Decl(contextualSignatureInstantiation2.ts, 2, 54))
>U : U, Symbol(U, Decl(contextualSignatureInstantiation2.ts, 2, 33))
>S : S, Symbol(S, Decl(contextualSignatureInstantiation2.ts, 2, 9))
>(x) => f(g(x)) : (x: U) => S
>x : U, Symbol(x, Decl(contextualSignatureInstantiation2.ts, 2, 68))
>f(g(x)) : S
>f : (_: T) => S, Symbol(f, Decl(contextualSignatureInstantiation2.ts, 2, 13))
>g(x) : T
>g : (_: U) => T, Symbol(g, Decl(contextualSignatureInstantiation2.ts, 2, 36))
>x : U, Symbol(x, Decl(contextualSignatureInstantiation2.ts, 2, 68))

var id: <T>(x:T) => T;
>id : <T>(x: T) => T, Symbol(id, Decl(contextualSignatureInstantiation2.ts, 3, 3))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 3, 9))
>x : T, Symbol(x, Decl(contextualSignatureInstantiation2.ts, 3, 12))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 3, 9))
>T : T, Symbol(T, Decl(contextualSignatureInstantiation2.ts, 3, 9))

var r23 = dot(id)(id);
>r23 : (_: {}) => {}, Symbol(r23, Decl(contextualSignatureInstantiation2.ts, 4, 3))
>dot(id)(id) : (_: {}) => {}
>dot(id) : <U>(g: (_: U) => {}) => (_: U) => {}
>dot : <T, S>(f: (_: T) => S) => <U>(g: (_: U) => T) => (_: U) => S, Symbol(dot, Decl(contextualSignatureInstantiation2.ts, 1, 3))
>id : <T>(x: T) => T, Symbol(id, Decl(contextualSignatureInstantiation2.ts, 3, 3))
>id : <T>(x: T) => T, Symbol(id, Decl(contextualSignatureInstantiation2.ts, 3, 3))