microsoft
diff --git a/‎src/compiler/checker.ts
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+112-99Lines changed: 112 additions & 99 deletions b/‎src/compiler/checker.ts
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+112-99Lines changed: 112 additions & 99 deletions
diff --git a/‎src/compiler/diagnosticMessages.json
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+4Lines changed: 4 additions & 0 deletions b/‎src/compiler/diagnosticMessages.json
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+4Lines changed: 4 additions & 0 deletions
diff --git a/‎tests/baselines/reference/augmentedTypeAssignmentCompatIndexSignature.errors.txt
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+1-6Lines changed: 1 addition & 6 deletions b/‎tests/baselines/reference/augmentedTypeAssignmentCompatIndexSignature.errors.txt
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+1-6Lines changed: 1 addition & 6 deletions
diff --git a/‎tests/baselines/reference/badOverloadError.types
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+1-1Lines changed: 1 addition & 1 deletion b/‎tests/baselines/reference/badOverloadError.types
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diff --git a/‎tests/baselines/reference/bestCommonTypeWithContextualTyping.types
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+1-1Lines changed: 1 addition & 1 deletion b/‎tests/baselines/reference/bestCommonTypeWithContextualTyping.types
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.errors.txt
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+2-50Lines changed: 2 additions & 50 deletions b/‎tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.errors.txt
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+2-50Lines changed: 2 additions & 50 deletions
diff --git a/‎tests/baselines/reference/compoundAdditionAssignmentLHSCanBeAssigned.types
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+1-1Lines changed: 1 addition & 1 deletion b/‎tests/baselines/reference/compoundAdditionAssignmentLHSCanBeAssigned.types
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diff --git a/‎tests/baselines/reference/computedPropertyNames10_ES5.types
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+2-2Lines changed: 2 additions & 2 deletions b/‎tests/baselines/reference/computedPropertyNames10_ES5.types
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diff --git a/‎tests/baselines/reference/computedPropertyNames10_ES6.types
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+2-2Lines changed: 2 additions & 2 deletions b/‎tests/baselines/reference/computedPropertyNames10_ES6.types
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diff --git a/‎tests/baselines/reference/computedPropertyNames11_ES5.types
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+2-2Lines changed: 2 additions & 2 deletions b/‎tests/baselines/reference/computedPropertyNames11_ES5.types
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@@ -1703,6 +1703,10 @@
         "category": "Error",
         "code": 2529
     },
+    "Property '{0}' is incompatible with index signature.": {
+        "category": "Error",
+        "code": 2530
+    },
     "JSX element attributes type '{0}' may not be a union type.": {
         "category": "Error",
         "code": 2600
 
@@ -1,10 +1,8 @@
-tests/cases/conformance/types/members/augmentedTypeAssignmentCompatIndexSignature.ts(15,5): error TS2322: Type '{}' is not assignable to type '{ [n: number]: Foo; }'.
-  Index signature is missing in type '{}'.
 tests/cases/conformance/types/members/augmentedTypeAssignmentCompatIndexSignature.ts(19,5): error TS2322: Type '() => void' is not assignable to type '{ [n: number]: Bar; }'.
   Index signature is missing in type '() => void'.
 
 
-==== tests/cases/conformance/types/members/augmentedTypeAssignmentCompatIndexSignature.ts (2 errors) ====
+==== tests/cases/conformance/types/members/augmentedTypeAssignmentCompatIndexSignature.ts (1 errors) ====
     interface Foo { a }
     interface Bar { b }
 
@@ -20,9 +18,6 @@ tests/cases/conformance/types/members/augmentedTypeAssignmentCompatIndexSignatur
     var f = () => { };
 
     var v1: {
-        ~~
-!!! error TS2322: Type '{}' is not assignable to type '{ [n: number]: Foo; }'.
-!!! error TS2322:   Index signature is missing in type '{}'.
         [n: number]: Foo
     } = o; // Should be allowed
 
 
@@ -6,6 +6,6 @@ function method() {
 >dictionary : { [index: string]: string; }
 ><{ [index: string]: string; }>{} : { [index: string]: string; }
 >index : string
->{} : { [x: string]: undefined; }
+>{} : {}
 }
 
@@ -36,7 +36,7 @@ var obj: { [s: string]: Contextual } = { s: e }; // { s: Ellement; [s: string]:
 >obj : { [s: string]: Contextual; }
 >s : string
 >Contextual : Contextual
->{ s: e } : { [x: string]: Ellement; s: Ellement; }
+>{ s: e } : { s: Ellement; }
 >s : Ellement
 >e : Ellement
 
 
@@ -98,7 +98,7 @@ x2 += E.a;
 x2 += {};
 >x2 += {} : string
 >x2 : string
->{} : { [x: number]: undefined; }
+>{} : {}
 
 x2 += null;
 >x2 += null : string
 
@@ -9,8 +9,8 @@ var a: any;
 >a : any
 
 var v = {
->v : { [0](): void; [""](): void; }
->{    [s]() { },    [n]() { },    [s + s]() { },    [s + n]() { },    [+s]() { },    [""]() { },    [0]() { },    [a]() { },    [<any>true]() { },    [`hello bye`]() { },    [`hello ${a} bye`]() { }} : { [0](): void; [""](): void; }
+>v : { [x: string]: () => void; [x: number]: () => void; [0](): void; [""](): void; }
+>{    [s]() { },    [n]() { },    [s + s]() { },    [s + n]() { },    [+s]() { },    [""]() { },    [0]() { },    [a]() { },    [<any>true]() { },    [`hello bye`]() { },    [`hello ${a} bye`]() { }} : { [x: string]: () => void; [x: number]: () => void; [0](): void; [""](): void; }
 
     [s]() { },
 >s : string
 
@@ -9,8 +9,8 @@ var a: any;
 >a : any
 
 var v = {
->v : { [0](): void; [""](): void; }
->{    [s]() { },    [n]() { },    [s + s]() { },    [s + n]() { },    [+s]() { },    [""]() { },    [0]() { },    [a]() { },    [<any>true]() { },    [`hello bye`]() { },    [`hello ${a} bye`]() { }} : { [0](): void; [""](): void; }
+>v : { [x: string]: () => void; [x: number]: () => void; [0](): void; [""](): void; }
+>{    [s]() { },    [n]() { },    [s + s]() { },    [s + n]() { },    [+s]() { },    [""]() { },    [0]() { },    [a]() { },    [<any>true]() { },    [`hello bye`]() { },    [`hello ${a} bye`]() { }} : { [x: string]: () => void; [x: number]: () => void; [0](): void; [""](): void; }
 
     [s]() { },
 >s : string
 
@@ -9,8 +9,8 @@ var a: any;
 >a : any
 
 var v = {
->v : { readonly [0]: number; [""]: any; }
->{    get [s]() { return 0; },    set [n](v) { },    get [s + s]() { return 0; },    set [s + n](v) { },    get [+s]() { return 0; },    set [""](v) { },    get [0]() { return 0; },    set [a](v) { },    get [<any>true]() { return 0; },    set [`hello bye`](v) { },    get [`hello ${a} bye`]() { return 0; }} : { readonly [0]: number; [""]: any; }
+>v : { [x: string]: any; [x: number]: any; readonly [0]: number; [""]: any; }
+>{    get [s]() { return 0; },    set [n](v) { },    get [s + s]() { return 0; },    set [s + n](v) { },    get [+s]() { return 0; },    set [""](v) { },    get [0]() { return 0; },    set [a](v) { },    get [<any>true]() { return 0; },    set [`hello bye`](v) { },    get [`hello ${a} bye`]() { return 0; }} : { [x: string]: any; [x: number]: any; readonly [0]: number; [""]: any; }
 
     get [s]() { return 0; },
 >s : string
Original file line number	Diff line number	Diff line change
`@@ -6,6 +6,6 @@ function method() {`
`6`	`6`	`>dictionary : { [index: string]: string; }`
`7`	`7`	`><{ [index: string]: string; }>{} : { [index: string]: string; }`
`8`	`8`	`>index : string`
`9`		`->{} : { [x: string]: undefined; }`
	`9`	`+>{} : {}`
`10`	`10`	`}`
`11`	`11`