Add regression test

ahejlsberg · ahejlsberg · commit 59dc85797e22 · 2019-05-31T11:04:02.000-07:00
diff --git a/tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts b/tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts
@@ -139,11 +139,12 @@ function fn4<K extends number>() {
     let y: ReadonlyArray<string>[K] = 'abc';
 }
 
-// Repro from #31439
+// Repro from #31439 and #31691
 
 export class c {
   [x: string]: string;
   constructor() {
+    this.a = "b";
     this["a"] = "b";
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -139,11 +139,12 @@ function fn4<K extends number>() {`
`139`	`139`	`let y: ReadonlyArray<string>[K] = 'abc';`
`140`	`140`	`}`
`141`	`141`
`142`		`-// Repro from #31439`
	`142`	`+// Repro from #31439 and #31691`
`143`	`143`
`144`	`144`	`export class c {`
`145`	`145`	`[x: string]: string;`
`146`	`146`	`constructor() {`
	`147`	`+ this.a = "b";`
`147`	`148`	`this["a"] = "b";`
`148`	`149`	`}`
`149`	`150`	`}`