=== tests/cases/conformance/types/typeRelationships/typeInference/contextualSignatureInstantiation.ts ===
// TypeScript Spec, section 4.12.2:
// If e is an expression of a function type that contains exactly one generic call signature and no other members,
// and T is a function type with exactly one non - generic call signature and no other members, then any inferences
// made for type parameters referenced by the parameters of T's call signature are fixed, and e's type is changed
// to a function type with e's call signature instantiated in the context of T's call signature (section 3.8.5).

declare function foo<T>(cb: (x: number, y: string) => T): T;
>foo : Symbol(foo, Decl(contextualSignatureInstantiation.ts, 0, 0))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 6, 21))
>cb : Symbol(cb, Decl(contextualSignatureInstantiation.ts, 6, 24))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 6, 29))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 6, 39))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 6, 21))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 6, 21))

declare function bar<T, U, V>(x: T, y: U, cb: (x: T, y: U) => V): V;
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 7, 21))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 7, 23))
>V : Symbol(V, Decl(contextualSignatureInstantiation.ts, 7, 26))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 7, 30))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 7, 21))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 7, 35))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 7, 23))
>cb : Symbol(cb, Decl(contextualSignatureInstantiation.ts, 7, 41))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 7, 47))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 7, 21))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 7, 52))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 7, 23))
>V : Symbol(V, Decl(contextualSignatureInstantiation.ts, 7, 26))
>V : Symbol(V, Decl(contextualSignatureInstantiation.ts, 7, 26))

declare function baz<T, U>(x: T, y: T, cb: (x: T, y: T) => U): U;
>baz : Symbol(baz, Decl(contextualSignatureInstantiation.ts, 7, 68))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 8, 21))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 8, 23))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 8, 27))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 8, 21))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 8, 32))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 8, 21))
>cb : Symbol(cb, Decl(contextualSignatureInstantiation.ts, 8, 38))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 8, 44))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 8, 21))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 8, 49))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 8, 21))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 8, 23))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 8, 23))

declare function g<T>(x: T, y: T): T;
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 10, 19))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 10, 22))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 10, 19))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 10, 27))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 10, 19))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 10, 19))

declare function h<T, U>(x: T, y: U): T[] | U[];
>h : Symbol(h, Decl(contextualSignatureInstantiation.ts, 10, 37))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 11, 19))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 11, 21))
>x : Symbol(x, Decl(contextualSignatureInstantiation.ts, 11, 25))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 11, 19))
>y : Symbol(y, Decl(contextualSignatureInstantiation.ts, 11, 30))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 11, 21))
>T : Symbol(T, Decl(contextualSignatureInstantiation.ts, 11, 19))
>U : Symbol(U, Decl(contextualSignatureInstantiation.ts, 11, 21))

var a: number;
>a : Symbol(a, Decl(contextualSignatureInstantiation.ts, 13, 3), Decl(contextualSignatureInstantiation.ts, 14, 3), Decl(contextualSignatureInstantiation.ts, 15, 3))

var a = bar(1, 1, g);      // Should be number
>a : Symbol(a, Decl(contextualSignatureInstantiation.ts, 13, 3), Decl(contextualSignatureInstantiation.ts, 14, 3), Decl(contextualSignatureInstantiation.ts, 15, 3))
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var a = baz(1, 1, g);      // Should be number
>a : Symbol(a, Decl(contextualSignatureInstantiation.ts, 13, 3), Decl(contextualSignatureInstantiation.ts, 14, 3), Decl(contextualSignatureInstantiation.ts, 15, 3))
>baz : Symbol(baz, Decl(contextualSignatureInstantiation.ts, 7, 68))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var b: number | string;
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))

var b = foo(g);            // Should be number | string
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>foo : Symbol(foo, Decl(contextualSignatureInstantiation.ts, 0, 0))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var b = bar(1, "one", g);  // Should be number | string
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var b = bar("one", 1, g);  // Should be number | string
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var b = baz(b, b, g);      // Should be number | string
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>baz : Symbol(baz, Decl(contextualSignatureInstantiation.ts, 7, 68))
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>b : Symbol(b, Decl(contextualSignatureInstantiation.ts, 17, 3), Decl(contextualSignatureInstantiation.ts, 18, 3), Decl(contextualSignatureInstantiation.ts, 19, 3), Decl(contextualSignatureInstantiation.ts, 20, 3), Decl(contextualSignatureInstantiation.ts, 21, 3))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))

var d: number[] | string[];
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))

var d = foo(h);            // Should be number[] | string[]
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>foo : Symbol(foo, Decl(contextualSignatureInstantiation.ts, 0, 0))
>h : Symbol(h, Decl(contextualSignatureInstantiation.ts, 10, 37))

var d = bar(1, "one", h);  // Should be number[] | string[]
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>h : Symbol(h, Decl(contextualSignatureInstantiation.ts, 10, 37))

var d = bar("one", 1, h);  // Should be number[] | string[]
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>bar : Symbol(bar, Decl(contextualSignatureInstantiation.ts, 6, 60))
>h : Symbol(h, Decl(contextualSignatureInstantiation.ts, 10, 37))

var d = baz(d, d, g);      // Should be number[] | string[]
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>baz : Symbol(baz, Decl(contextualSignatureInstantiation.ts, 7, 68))
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>d : Symbol(d, Decl(contextualSignatureInstantiation.ts, 23, 3), Decl(contextualSignatureInstantiation.ts, 24, 3), Decl(contextualSignatureInstantiation.ts, 25, 3), Decl(contextualSignatureInstantiation.ts, 26, 3), Decl(contextualSignatureInstantiation.ts, 27, 3))
>g : Symbol(g, Decl(contextualSignatureInstantiation.ts, 8, 65))