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=== tests/cases/conformance/types/union/unionTypeCallSignatures4.ts ===
type F1 = (a: string, b?: string) => void;
>F1 : Symbol(F1, Decl(unionTypeCallSignatures4.ts, 0, 0))
>a : Symbol(a, Decl(unionTypeCallSignatures4.ts, 0, 11))
>b : Symbol(b, Decl(unionTypeCallSignatures4.ts, 0, 21))
type F2 = (a: string, b?: string, c?: string) => void;
>F2 : Symbol(F2, Decl(unionTypeCallSignatures4.ts, 0, 42))
>a : Symbol(a, Decl(unionTypeCallSignatures4.ts, 1, 11))
>b : Symbol(b, Decl(unionTypeCallSignatures4.ts, 1, 21))
>c : Symbol(c, Decl(unionTypeCallSignatures4.ts, 1, 33))
type F3 = (a: string, ...rest: string[]) => void;
>F3 : Symbol(F3, Decl(unionTypeCallSignatures4.ts, 1, 54))
>a : Symbol(a, Decl(unionTypeCallSignatures4.ts, 2, 11))
>rest : Symbol(rest, Decl(unionTypeCallSignatures4.ts, 2, 21))
type F4 = (a: string, b?: string, ...rest: string[]) => void;
>F4 : Symbol(F4, Decl(unionTypeCallSignatures4.ts, 2, 49))
>a : Symbol(a, Decl(unionTypeCallSignatures4.ts, 3, 11))
>b : Symbol(b, Decl(unionTypeCallSignatures4.ts, 3, 21))
>rest : Symbol(rest, Decl(unionTypeCallSignatures4.ts, 3, 33))
type F5 = (a: string, b: string) => void;
>F5 : Symbol(F5, Decl(unionTypeCallSignatures4.ts, 3, 61))
>a : Symbol(a, Decl(unionTypeCallSignatures4.ts, 4, 11))
>b : Symbol(b, Decl(unionTypeCallSignatures4.ts, 4, 21))
var f12: F1 | F2;
>f12 : Symbol(f12, Decl(unionTypeCallSignatures4.ts, 6, 3))
>F1 : Symbol(F1, Decl(unionTypeCallSignatures4.ts, 0, 0))
>F2 : Symbol(F2, Decl(unionTypeCallSignatures4.ts, 0, 42))
f12("a");
>f12 : Symbol(f12, Decl(unionTypeCallSignatures4.ts, 6, 3))
f12("a", "b");
>f12 : Symbol(f12, Decl(unionTypeCallSignatures4.ts, 6, 3))
f12("a", "b", "c"); // ok
>f12 : Symbol(f12, Decl(unionTypeCallSignatures4.ts, 6, 3))
var f34: F3 | F4;
>f34 : Symbol(f34, Decl(unionTypeCallSignatures4.ts, 11, 3))
>F3 : Symbol(F3, Decl(unionTypeCallSignatures4.ts, 1, 54))
>F4 : Symbol(F4, Decl(unionTypeCallSignatures4.ts, 2, 49))
f34("a");
>f34 : Symbol(f34, Decl(unionTypeCallSignatures4.ts, 11, 3))
f34("a", "b");
>f34 : Symbol(f34, Decl(unionTypeCallSignatures4.ts, 11, 3))
f34("a", "b", "c");
>f34 : Symbol(f34, Decl(unionTypeCallSignatures4.ts, 11, 3))
var f1234: F1 | F2 | F3 | F4;
>f1234 : Symbol(f1234, Decl(unionTypeCallSignatures4.ts, 16, 3))
>F1 : Symbol(F1, Decl(unionTypeCallSignatures4.ts, 0, 0))
>F2 : Symbol(F2, Decl(unionTypeCallSignatures4.ts, 0, 42))
>F3 : Symbol(F3, Decl(unionTypeCallSignatures4.ts, 1, 54))
>F4 : Symbol(F4, Decl(unionTypeCallSignatures4.ts, 2, 49))
f1234("a");
>f1234 : Symbol(f1234, Decl(unionTypeCallSignatures4.ts, 16, 3))
f1234("a", "b");
>f1234 : Symbol(f1234, Decl(unionTypeCallSignatures4.ts, 16, 3))
f1234("a", "b", "c"); // ok
>f1234 : Symbol(f1234, Decl(unionTypeCallSignatures4.ts, 16, 3))
var f12345: F1 | F2 | F3 | F4 | F5;
>f12345 : Symbol(f12345, Decl(unionTypeCallSignatures4.ts, 21, 3))
>F1 : Symbol(F1, Decl(unionTypeCallSignatures4.ts, 0, 0))
>F2 : Symbol(F2, Decl(unionTypeCallSignatures4.ts, 0, 42))
>F3 : Symbol(F3, Decl(unionTypeCallSignatures4.ts, 1, 54))
>F4 : Symbol(F4, Decl(unionTypeCallSignatures4.ts, 2, 49))
>F5 : Symbol(F5, Decl(unionTypeCallSignatures4.ts, 3, 61))
f12345("a"); // error
>f12345 : Symbol(f12345, Decl(unionTypeCallSignatures4.ts, 21, 3))
f12345("a", "b");
>f12345 : Symbol(f12345, Decl(unionTypeCallSignatures4.ts, 21, 3))
f12345("a", "b", "c"); // error
>f12345 : Symbol(f12345, Decl(unionTypeCallSignatures4.ts, 21, 3))
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