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=== tests/cases/conformance/types/tuple/optionalTupleElements1.ts ===
type T1 = [number, string, boolean];
>T1 : Symbol(T1, Decl(optionalTupleElements1.ts, 0, 0))
type T2 = [number, string, boolean?];
>T2 : Symbol(T2, Decl(optionalTupleElements1.ts, 0, 36))
type T3 = [number, string?, boolean?];
>T3 : Symbol(T3, Decl(optionalTupleElements1.ts, 1, 37))
type T4 = [number?, string?, boolean?];
>T4 : Symbol(T4, Decl(optionalTupleElements1.ts, 2, 38))
type L1 = T1["length"];
>L1 : Symbol(L1, Decl(optionalTupleElements1.ts, 3, 39))
>T1 : Symbol(T1, Decl(optionalTupleElements1.ts, 0, 0))
type L2 = T2["length"];
>L2 : Symbol(L2, Decl(optionalTupleElements1.ts, 5, 23))
>T2 : Symbol(T2, Decl(optionalTupleElements1.ts, 0, 36))
type L3 = T3["length"];
>L3 : Symbol(L3, Decl(optionalTupleElements1.ts, 6, 23))
>T3 : Symbol(T3, Decl(optionalTupleElements1.ts, 1, 37))
type L4 = T4["length"];
>L4 : Symbol(L4, Decl(optionalTupleElements1.ts, 7, 23))
>T4 : Symbol(T4, Decl(optionalTupleElements1.ts, 2, 38))
type T5 = [number, string?, boolean]; // Error
>T5 : Symbol(T5, Decl(optionalTupleElements1.ts, 8, 23))
function f1(t1: T1, t2: T2, t3: T3, t4: T4) {
>f1 : Symbol(f1, Decl(optionalTupleElements1.ts, 10, 37))
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
>T1 : Symbol(T1, Decl(optionalTupleElements1.ts, 0, 0))
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
>T2 : Symbol(T2, Decl(optionalTupleElements1.ts, 0, 36))
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
>T3 : Symbol(T3, Decl(optionalTupleElements1.ts, 1, 37))
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
>T4 : Symbol(T4, Decl(optionalTupleElements1.ts, 2, 38))
t1 = t1;
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
t1 = t2; // Error
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
t1 = t3; // Error
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
t1 = t4; // Error
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
t2 = t1;
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
t2 = t2;
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
t2 = t3; // Error
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
t2 = t4; // Error
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
t3 = t1;
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
t3 = t2;
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
t3 = t3;
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
t3 = t4; // Error
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
t4 = t1;
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
>t1 : Symbol(t1, Decl(optionalTupleElements1.ts, 12, 12))
t4 = t2;
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 12, 19))
t4 = t3;
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 12, 27))
t4 = t4;
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 12, 35))
}
let t2: T2;
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 31, 3))
>T2 : Symbol(T2, Decl(optionalTupleElements1.ts, 0, 36))
let t3: T3;
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 32, 3))
>T3 : Symbol(T3, Decl(optionalTupleElements1.ts, 1, 37))
let t4: T4;
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
>T4 : Symbol(T4, Decl(optionalTupleElements1.ts, 2, 38))
t2 = [42, "hello"];
>t2 : Symbol(t2, Decl(optionalTupleElements1.ts, 31, 3))
t3 = [42, "hello"];
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 32, 3))
t3 = [42,,true]
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 32, 3))
t3 = [42];
>t3 : Symbol(t3, Decl(optionalTupleElements1.ts, 32, 3))
t4 = [42, "hello"];
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
t4 = [42,,true];
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
t4 = [,"hello", true];
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
t4 = [,,true];
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
t4 = [];
>t4 : Symbol(t4, Decl(optionalTupleElements1.ts, 33, 3))
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