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Merged
merged 2 commits into from
Nov 7, 2015
Merged

Instance of else clause #5092

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5bcd8b3
Fixes instance of type exclusion in else clause
tinganho Oct 6, 2015
dd54b7a
Adds tests
tinganho Oct 6, 2015
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10 changes: 9 additions & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6362,9 +6362,10 @@ namespace ts {

function narrowTypeByInstanceof(type: Type, expr: BinaryExpression, assumeTrue: boolean): Type {
// Check that type is not any, assumed result is true, and we have variable symbol on the left
if (isTypeAny(type) || !assumeTrue || expr.left.kind !== SyntaxKind.Identifier || getResolvedSymbol(<Identifier>expr.left) !== symbol) {
if (isTypeAny(type) || expr.left.kind !== SyntaxKind.Identifier || getResolvedSymbol(<Identifier>expr.left) !== symbol) {
return type;
}

// Check that right operand is a function type with a prototype property
let rightType = checkExpression(expr.right);
if (!isTypeSubtypeOf(rightType, globalFunctionType)) {
Expand Down Expand Up @@ -6396,6 +6397,13 @@ namespace ts {
}

if (targetType) {
if (!assumeTrue) {
if (type.flags & TypeFlags.Union) {
return getUnionType(filter((<UnionType>type).types, t => !isTypeSubtypeOf(t, targetType)));
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@RyanCavanaugh what happened with the idea that if the RHS type isn't a subtype of any types in the union, that we just discard the LHS type and take the RHS type? Is that something that we eventually went with?

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I don't remember what we decided on that.

}
return type;
}

return getNarrowedType(type, targetType);
}

Expand Down
2 changes: 1 addition & 1 deletion tests/baselines/reference/narrowTypeByInstanceof.types
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,7 @@ if (elementA instanceof FileMatch && elementB instanceof FileMatch) {
} else if (elementA instanceof Match && elementB instanceof Match) {
>elementA instanceof Match && elementB instanceof Match : boolean
>elementA instanceof Match : boolean
>elementA : FileMatch | Match
>elementA : Match | FileMatch
>Match : typeof Match
>elementB instanceof Match : boolean
>elementB : FileMatch | Match
Expand Down
112 changes: 92 additions & 20 deletions tests/baselines/reference/typeGuardOfFormInstanceOf.js
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Expand Up @@ -14,21 +14,58 @@ class C2 {
class D1 extends C1 {
p3: number;
}
class C3 {
p4: number;
}
var str: string;
var num: number;
var strOrNum: string | number;

var c1Orc2: C1 | C2;
str = c1Orc2 instanceof C1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof C2 && c1Orc2.p2; // C2
str = c1Orc2 instanceof D1 && c1Orc2.p1; // D1
num = c1Orc2 instanceof D1 && c1Orc2.p3; // D1
var ctor1: C1 | C2;
str = ctor1 instanceof C1 && ctor1.p1; // C1
num = ctor1 instanceof C2 && ctor1.p2; // C2
str = ctor1 instanceof D1 && ctor1.p1; // D1
num = ctor1 instanceof D1 && ctor1.p3; // D1

var ctor2: C2 | D1;
num = ctor2 instanceof C2 && ctor2.p2; // C2
num = ctor2 instanceof D1 && ctor2.p3; // D1
str = ctor2 instanceof D1 && ctor2.p1; // D1
var r2: D1 | C2 = ctor2 instanceof C1 && ctor2; // C2 | D1

var ctor3: C1 | C2;
if (ctor3 instanceof C1) {
ctor3.p1; // C1
}
else {
ctor3.p2; // C2
}

var c2Ord1: C2 | D1;
num = c2Ord1 instanceof C2 && c2Ord1.p2; // C2
num = c2Ord1 instanceof D1 && c2Ord1.p3; // D1
str = c2Ord1 instanceof D1 && c2Ord1.p1; // D1
var r2: D1 | C2 = c2Ord1 instanceof C1 && c2Ord1; // C2 | D1
var ctor4: C1 | C2 | C3;
if (ctor4 instanceof C1) {
ctor4.p1; // C1
}
else if (ctor4 instanceof C2) {
ctor4.p2; // C2
}
else {
ctor4.p4; // C3
}

var ctor5: C1 | D1 | C2;
if (ctor5 instanceof C1) {
ctor5.p1; // C1
}
else {
ctor5.p2; // C2
}

var ctor6: C1 | C2 | C3;
if (ctor6 instanceof C1 || ctor6 instanceof C2) {
}
else {
ctor6.p4; // C3
}

//// [typeGuardOfFormInstanceOf.js]
// A type guard of the form x instanceof C, where C is of a subtype of the global type 'Function'
Expand Down Expand Up @@ -58,16 +95,51 @@ var D1 = (function (_super) {
}
return D1;
})(C1);
var C3 = (function () {
function C3() {
}
return C3;
})();
var str;
var num;
var strOrNum;
var c1Orc2;
str = c1Orc2 instanceof C1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof C2 && c1Orc2.p2; // C2
str = c1Orc2 instanceof D1 && c1Orc2.p1; // D1
num = c1Orc2 instanceof D1 && c1Orc2.p3; // D1
var c2Ord1;
num = c2Ord1 instanceof C2 && c2Ord1.p2; // C2
num = c2Ord1 instanceof D1 && c2Ord1.p3; // D1
str = c2Ord1 instanceof D1 && c2Ord1.p1; // D1
var r2 = c2Ord1 instanceof C1 && c2Ord1; // C2 | D1
var ctor1;
str = ctor1 instanceof C1 && ctor1.p1; // C1
num = ctor1 instanceof C2 && ctor1.p2; // C2
str = ctor1 instanceof D1 && ctor1.p1; // D1
num = ctor1 instanceof D1 && ctor1.p3; // D1
var ctor2;
num = ctor2 instanceof C2 && ctor2.p2; // C2
num = ctor2 instanceof D1 && ctor2.p3; // D1
str = ctor2 instanceof D1 && ctor2.p1; // D1
var r2 = ctor2 instanceof C1 && ctor2; // C2 | D1
var ctor3;
if (ctor3 instanceof C1) {
ctor3.p1; // C1
}
else {
ctor3.p2; // C2
}
var ctor4;
if (ctor4 instanceof C1) {
ctor4.p1; // C1
}
else if (ctor4 instanceof C2) {
ctor4.p2; // C2
}
else {
ctor4.p4; // C3
}
var ctor5;
if (ctor5 instanceof C1) {
ctor5.p1; // C1
}
else {
ctor5.p2; // C2
}
var ctor6;
if (ctor6 instanceof C1 || ctor6 instanceof C2) {
}
else {
ctor6.p4; // C3
}
190 changes: 144 additions & 46 deletions tests/baselines/reference/typeGuardOfFormInstanceOf.symbols
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Expand Up @@ -24,86 +24,184 @@ class D1 extends C1 {
p3: number;
>p3 : Symbol(p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))
}
class C3 {
>C3 : Symbol(C3, Decl(typeGuardOfFormInstanceOf.ts, 14, 1))

p4: number;
>p4 : Symbol(p4, Decl(typeGuardOfFormInstanceOf.ts, 15, 10))
}
var str: string;
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 15, 3))
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 18, 3))

var num: number;
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 16, 3))
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))

var strOrNum: string | number;
>strOrNum : Symbol(strOrNum, Decl(typeGuardOfFormInstanceOf.ts, 17, 3))
>strOrNum : Symbol(strOrNum, Decl(typeGuardOfFormInstanceOf.ts, 20, 3))

var c1Orc2: C1 | C2;
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
var ctor1: C1 | C2;
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))

str = c1Orc2 instanceof C1 && c1Orc2.p1; // C1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 15, 3))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
str = ctor1 instanceof C1 && ctor1.p1; // C1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 18, 3))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>c1Orc2.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))

num = c1Orc2 instanceof C2 && c1Orc2.p2; // C2
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 16, 3))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
num = ctor1 instanceof C2 && ctor1.p2; // C2
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>c1Orc2.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))

str = c1Orc2 instanceof D1 && c1Orc2.p1; // D1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 15, 3))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
str = ctor1 instanceof D1 && ctor1.p1; // D1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 18, 3))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>c1Orc2.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))

num = c1Orc2 instanceof D1 && c1Orc2.p3; // D1
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 16, 3))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
num = ctor1 instanceof D1 && ctor1.p3; // D1
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>c1Orc2.p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))
>c1Orc2 : Symbol(c1Orc2, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor1.p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))
>ctor1 : Symbol(ctor1, Decl(typeGuardOfFormInstanceOf.ts, 22, 3))
>p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))

var c2Ord1: C2 | D1;
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
var ctor2: C2 | D1;
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))

num = c2Ord1 instanceof C2 && c2Ord1.p2; // C2
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 16, 3))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
num = ctor2 instanceof C2 && ctor2.p2; // C2
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>c2Ord1.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
>ctor2.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))

num = c2Ord1 instanceof D1 && c2Ord1.p3; // D1
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 16, 3))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
num = ctor2 instanceof D1 && ctor2.p3; // D1
>num : Symbol(num, Decl(typeGuardOfFormInstanceOf.ts, 19, 3))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>c2Ord1.p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
>ctor2.p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>p3 : Symbol(D1.p3, Decl(typeGuardOfFormInstanceOf.ts, 12, 21))

str = c2Ord1 instanceof D1 && c2Ord1.p1; // D1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 15, 3))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
str = ctor2 instanceof D1 && ctor2.p1; // D1
>str : Symbol(str, Decl(typeGuardOfFormInstanceOf.ts, 18, 3))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>c2Ord1.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
>ctor2.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))

var r2: D1 | C2 = c2Ord1 instanceof C1 && c2Ord1; // C2 | D1
>r2 : Symbol(r2, Decl(typeGuardOfFormInstanceOf.ts, 29, 3))
var r2: D1 | C2 = ctor2 instanceof C1 && ctor2; // C2 | D1
>r2 : Symbol(r2, Decl(typeGuardOfFormInstanceOf.ts, 32, 3))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>ctor2 : Symbol(ctor2, Decl(typeGuardOfFormInstanceOf.ts, 28, 3))

var ctor3: C1 | C2;
>ctor3 : Symbol(ctor3, Decl(typeGuardOfFormInstanceOf.ts, 34, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))

if (ctor3 instanceof C1) {
>ctor3 : Symbol(ctor3, Decl(typeGuardOfFormInstanceOf.ts, 34, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))

ctor3.p1; // C1
>ctor3.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor3 : Symbol(ctor3, Decl(typeGuardOfFormInstanceOf.ts, 34, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
}
else {
ctor3.p2; // C2
>ctor3.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>ctor3 : Symbol(ctor3, Decl(typeGuardOfFormInstanceOf.ts, 34, 3))
>p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
}

var ctor4: C1 | C2 | C3;
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>C3 : Symbol(C3, Decl(typeGuardOfFormInstanceOf.ts, 14, 1))

if (ctor4 instanceof C1) {
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>c2Ord1 : Symbol(c2Ord1, Decl(typeGuardOfFormInstanceOf.ts, 25, 3))

ctor4.p1; // C1
>ctor4.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
}
else if (ctor4 instanceof C2) {
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))

ctor4.p2; // C2
>ctor4.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
}
else {
ctor4.p4; // C3
>ctor4.p4 : Symbol(C3.p4, Decl(typeGuardOfFormInstanceOf.ts, 15, 10))
>ctor4 : Symbol(ctor4, Decl(typeGuardOfFormInstanceOf.ts, 42, 3))
>p4 : Symbol(C3.p4, Decl(typeGuardOfFormInstanceOf.ts, 15, 10))
}

var ctor5: C1 | D1 | C2;
>ctor5 : Symbol(ctor5, Decl(typeGuardOfFormInstanceOf.ts, 53, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>D1 : Symbol(D1, Decl(typeGuardOfFormInstanceOf.ts, 11, 1))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))

if (ctor5 instanceof C1) {
>ctor5 : Symbol(ctor5, Decl(typeGuardOfFormInstanceOf.ts, 53, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))

ctor5.p1; // C1
>ctor5.p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
>ctor5 : Symbol(ctor5, Decl(typeGuardOfFormInstanceOf.ts, 53, 3))
>p1 : Symbol(C1.p1, Decl(typeGuardOfFormInstanceOf.ts, 6, 10))
}
else {
ctor5.p2; // C2
>ctor5.p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
>ctor5 : Symbol(ctor5, Decl(typeGuardOfFormInstanceOf.ts, 53, 3))
>p2 : Symbol(C2.p2, Decl(typeGuardOfFormInstanceOf.ts, 9, 10))
}

var ctor6: C1 | C2 | C3;
>ctor6 : Symbol(ctor6, Decl(typeGuardOfFormInstanceOf.ts, 61, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
>C3 : Symbol(C3, Decl(typeGuardOfFormInstanceOf.ts, 14, 1))

if (ctor6 instanceof C1 || ctor6 instanceof C2) {
>ctor6 : Symbol(ctor6, Decl(typeGuardOfFormInstanceOf.ts, 61, 3))
>C1 : Symbol(C1, Decl(typeGuardOfFormInstanceOf.ts, 0, 0))
>ctor6 : Symbol(ctor6, Decl(typeGuardOfFormInstanceOf.ts, 61, 3))
>C2 : Symbol(C2, Decl(typeGuardOfFormInstanceOf.ts, 8, 1))
}
else {
ctor6.p4; // C3
>ctor6.p4 : Symbol(C3.p4, Decl(typeGuardOfFormInstanceOf.ts, 15, 10))
>ctor6 : Symbol(ctor6, Decl(typeGuardOfFormInstanceOf.ts, 61, 3))
>p4 : Symbol(C3.p4, Decl(typeGuardOfFormInstanceOf.ts, 15, 10))
}
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