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=== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignaturesWithOptionalParameters.ts ===
// call signatures in derived types must have the same or fewer optional parameters as the base type
interface Base {
>Base : Symbol(Base, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 0, 0))
a: () => number;
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a2: (x?: number) => number;
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 9))
a3: (x: number) => number;
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 9))
a4: (x: number, y?: number) => number;
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 9))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 19))
a5: (x?: number, y?: number) => number;
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 9))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 20))
a6: (x: number, y: number) => number;
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 8, 9))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 8, 19))
}
var b: Base;
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>Base : Symbol(Base, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 0, 0))
var a: () => number;
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
a = () => 1 // ok, same number of required params
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
a = (x?: number) => 1; // ok, same number of required params
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 14, 9))
a = (x: number) => 1; // error, too many required params
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 15, 9))
a = b.a; // ok
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a = b.a2; // ok
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
a = b.a3; // error
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
a = b.a4; // error
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
a = b.a5; // ok
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
a = b.a6; // error
>a : Symbol(a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 12, 3))
>b.a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
var a2: (x?: number) => number;
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 9))
a2 = () => 1; // ok, same number of required params
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
a2 = (x?: number) => 1; // ok, same number of required params
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 25, 10))
a2 = (x: number) => 1; // ok, same number of params
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 26, 10))
a2 = b.a; // ok
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a2 = b.a2; // ok
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
a2 = b.a3; // ok, same number of params
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
a2 = b.a4; // ok, excess params are optional in b.a3
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
a2 = b.a5; // ok
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
a2 = b.a6; // error
>a2 : Symbol(a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 23, 3))
>b.a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
var a3: (x: number) => number;
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 9))
a3 = () => 1; // ok, fewer required params
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
a3 = (x?: number) => 1; // ok, fewer required params
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 36, 10))
a3 = (x: number) => 1; // ok, same number of required params
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 37, 10))
a3 = (x: number, y: number) => 1; // error, too many required params
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 38, 10))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 38, 20))
a3 = b.a; // ok
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a3 = b.a2; // ok
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
a3 = b.a3; // ok
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
a3 = b.a4; // ok
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
a3 = b.a5; // ok
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
a3 = b.a6; // error
>a3 : Symbol(a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 34, 3))
>b.a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
var a4: (x: number, y?: number) => number;
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 9))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 19))
a4 = () => 1; // ok, fewer required params
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
a4 = (x?: number, y?: number) => 1; // ok, fewer required params
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 48, 10))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 48, 21))
a4 = (x: number) => 1; // ok, same number of required params
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 49, 10))
a4 = (x: number, y: number) => 1; // ok, same number of params
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 50, 10))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 50, 20))
a4 = b.a; // ok
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a4 = b.a2; // ok
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
a4 = b.a3; // ok
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
a4 = b.a4; // ok
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
a4 = b.a5; // ok
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
a4 = b.a6; // ok, same number of params
>a4 : Symbol(a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 46, 3))
>b.a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
var a5: (x?: number, y?: number) => number;
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 9))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 20))
a5 = () => 1; // ok, fewer required params
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
a5 = (x?: number, y?: number) => 1; // ok, fewer required params
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 60, 10))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 60, 21))
a5 = (x: number) => 1; // ok, fewer params in lambda
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 61, 10))
a5 = (x: number, y: number) => 1; // ok, same number of params
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>x : Symbol(x, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 62, 10))
>y : Symbol(y, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 62, 20))
a5 = b.a; // ok
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a : Symbol(Base.a, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 2, 16))
a5 = b.a2; // ok
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a2 : Symbol(Base.a2, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 3, 20))
a5 = b.a3; // ok, fewer params in b.a3
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a3 : Symbol(Base.a3, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 4, 31))
a5 = b.a4; // ok, same number of params
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a4 : Symbol(Base.a4, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 5, 30))
a5 = b.a5; // ok
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a5 : Symbol(Base.a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 6, 42))
a5 = b.a6; // ok, same number of params
>a5 : Symbol(a5, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 58, 3))
>b.a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
>b : Symbol(b, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 10, 3))
>a6 : Symbol(Base.a6, Decl(assignmentCompatWithCallSignaturesWithOptionalParameters.ts, 7, 43))
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