=== tests/cases/conformance/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator.ts ===
// If one operand is the null or undefined value, it is treated as having the type of the other operand.

enum E { a, b, c }
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))
>a : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))
>b : Symbol(E.b, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 11))
>c : Symbol(E.c, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 14))

var a: any;
>a : Symbol(a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 4, 3))

var b: number;
>b : Symbol(b, Decl(additionOperatorWithNullValueAndValidOperator.ts, 5, 3))

var c: E;
>c : Symbol(c, Decl(additionOperatorWithNullValueAndValidOperator.ts, 6, 3))
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))

var d: string;
>d : Symbol(d, Decl(additionOperatorWithNullValueAndValidOperator.ts, 7, 3))

// null + any
var r1: any = null + a;
>r1 : Symbol(r1, Decl(additionOperatorWithNullValueAndValidOperator.ts, 10, 3))
>a : Symbol(a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 4, 3))

var r2: any = a + null;
>r2 : Symbol(r2, Decl(additionOperatorWithNullValueAndValidOperator.ts, 11, 3))
>a : Symbol(a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 4, 3))

// null + number/enum
var r3 = null + b;
>r3 : Symbol(r3, Decl(additionOperatorWithNullValueAndValidOperator.ts, 14, 3))
>b : Symbol(b, Decl(additionOperatorWithNullValueAndValidOperator.ts, 5, 3))

var r4 = null + 1;
>r4 : Symbol(r4, Decl(additionOperatorWithNullValueAndValidOperator.ts, 15, 3))

var r5 = null + c;
>r5 : Symbol(r5, Decl(additionOperatorWithNullValueAndValidOperator.ts, 16, 3))
>c : Symbol(c, Decl(additionOperatorWithNullValueAndValidOperator.ts, 6, 3))

var r6 = null + E.a;
>r6 : Symbol(r6, Decl(additionOperatorWithNullValueAndValidOperator.ts, 17, 3))
>E.a : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))
>a : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))

var r7 = null + E['a'];
>r7 : Symbol(r7, Decl(additionOperatorWithNullValueAndValidOperator.ts, 18, 3))
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))
>'a' : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))

var r8 = b + null;
>r8 : Symbol(r8, Decl(additionOperatorWithNullValueAndValidOperator.ts, 19, 3))
>b : Symbol(b, Decl(additionOperatorWithNullValueAndValidOperator.ts, 5, 3))

var r9 = 1 + null;
>r9 : Symbol(r9, Decl(additionOperatorWithNullValueAndValidOperator.ts, 20, 3))

var r10 = c + null
>r10 : Symbol(r10, Decl(additionOperatorWithNullValueAndValidOperator.ts, 21, 3))
>c : Symbol(c, Decl(additionOperatorWithNullValueAndValidOperator.ts, 6, 3))

var r11 = E.a + null;
>r11 : Symbol(r11, Decl(additionOperatorWithNullValueAndValidOperator.ts, 22, 3))
>E.a : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))
>a : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))

var r12 = E['a'] + null;
>r12 : Symbol(r12, Decl(additionOperatorWithNullValueAndValidOperator.ts, 23, 3))
>E : Symbol(E, Decl(additionOperatorWithNullValueAndValidOperator.ts, 0, 0))
>'a' : Symbol(E.a, Decl(additionOperatorWithNullValueAndValidOperator.ts, 2, 8))

// null + string
var r13 = null + d;
>r13 : Symbol(r13, Decl(additionOperatorWithNullValueAndValidOperator.ts, 26, 3))
>d : Symbol(d, Decl(additionOperatorWithNullValueAndValidOperator.ts, 7, 3))

var r14 = null + '';
>r14 : Symbol(r14, Decl(additionOperatorWithNullValueAndValidOperator.ts, 27, 3))

var r15 = d + null;
>r15 : Symbol(r15, Decl(additionOperatorWithNullValueAndValidOperator.ts, 28, 3))
>d : Symbol(d, Decl(additionOperatorWithNullValueAndValidOperator.ts, 7, 3))

var r16 = '' + null;
>r16 : Symbol(r16, Decl(additionOperatorWithNullValueAndValidOperator.ts, 29, 3))