Address PR comments

sandersn · sandersn · commit 271ca80c75e3 · 2017-02-13T13:35:07.000-08:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -7777,8 +7777,10 @@ namespace ts {
                         return related;
                     }
                 }
-                const discriminantType = findMatchingDiscriminantType(source, target);
-                isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], reportErrors);
+                if (reportErrors) {
+                    const discriminantType = findMatchingDiscriminantType(source, target);
+                    isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], /*reportErrors*/ true);
+                }
                 return Ternary.False;
             }
 

Original file line number	Diff line number	Diff line change
`@@ -7777,8 +7777,10 @@ namespace ts {`
`7777`	`7777`	`return related;`
`7778`	`7778`	`}`
`7779`	`7779`	`}`
`7780`		`- const discriminantType = findMatchingDiscriminantType(source, target);`
`7781`		`- isRelatedTo(source, discriminantType \|\| targetTypes[targetTypes.length - 1], reportErrors);`
	`7780`	`+ if (reportErrors) {`
	`7781`	`+ const discriminantType = findMatchingDiscriminantType(source, target);`
	`7782`	`+ isRelatedTo(source, discriminantType \|\| targetTypes[targetTypes.length - 1], /reportErrors/ true);`
	`7783`	`+ }`
`7782`	`7784`	`return Ternary.False;`
`7783`	`7785`	`}`
`7784`	`7786`