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=== tests/cases/conformance/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndInvalidOperands.ts ===
// If one operand is the null or undefined value, it is treated as having the type of the other operand.
function foo(): void { return undefined }
>foo : Symbol(foo, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 0, 0))
>undefined : Symbol(undefined)
var a: boolean;
>a : Symbol(a, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 4, 3))
var b: Object;
>b : Symbol(b, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 5, 3))
>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
var c: void;
>c : Symbol(c, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 6, 3))
var d: Number;
>d : Symbol(d, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 7, 3))
>Number : Symbol(Number, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
// undefined + boolean/Object
var r1 = undefined + a;
>r1 : Symbol(r1, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 10, 3))
>undefined : Symbol(undefined)
>a : Symbol(a, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 4, 3))
var r2 = undefined + b;
>r2 : Symbol(r2, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 11, 3))
>undefined : Symbol(undefined)
>b : Symbol(b, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 5, 3))
var r3 = undefined + c;
>r3 : Symbol(r3, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 12, 3))
>undefined : Symbol(undefined)
>c : Symbol(c, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 6, 3))
var r4 = a + undefined;
>r4 : Symbol(r4, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 13, 3))
>a : Symbol(a, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 4, 3))
>undefined : Symbol(undefined)
var r5 = b + undefined;
>r5 : Symbol(r5, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 14, 3))
>b : Symbol(b, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 5, 3))
>undefined : Symbol(undefined)
var r6 = undefined + c;
>r6 : Symbol(r6, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 15, 3))
>undefined : Symbol(undefined)
>c : Symbol(c, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 6, 3))
// other cases
var r7 = undefined + d;
>r7 : Symbol(r7, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 18, 3))
>undefined : Symbol(undefined)
>d : Symbol(d, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 7, 3))
var r8 = undefined + true;
>r8 : Symbol(r8, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 19, 3))
>undefined : Symbol(undefined)
var r9 = undefined + { a: '' };
>r9 : Symbol(r9, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 20, 3))
>undefined : Symbol(undefined)
>a : Symbol(a, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 20, 22))
var r10 = undefined + foo();
>r10 : Symbol(r10, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 21, 3))
>undefined : Symbol(undefined)
>foo : Symbol(foo, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 0, 0))
var r11 = undefined + (() => { });
>r11 : Symbol(r11, Decl(additionOperatorWithUndefinedValueAndInvalidOperands.ts, 22, 3))
>undefined : Symbol(undefined)
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