Simplify mappedTypeStack cache key

sandersn · sandersn · commit 84d747a89cca · 2017-12-01T14:48:59.000-08:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -11395,7 +11395,7 @@ namespace ts {
                         // such that direct inferences to T get priority over inferences to Partial<T>, for example.
                         const inference = getInferenceInfoForType((<IndexType>constraintType).type);
                         if (inference && !inference.isFixed) {
-                            const key = (source.symbol ? getSymbolId(source.symbol) : "no symbol") + "," + getSymbolId(target.symbol);
+                            const key = (source.symbol ? getSymbolId(source.symbol) + "," : "") + getSymbolId(target.symbol);
                             if (contains(mappedTypeStack, key)) {
                                 return;
                             }

Original file line number	Diff line number	Diff line change
`@@ -11395,7 +11395,7 @@ namespace ts {`
`11395`	`11395`	`// such that direct inferences to T get priority over inferences to Partial<T>, for example.`
`11396`	`11396`	`const inference = getInferenceInfoForType((<IndexType>constraintType).type);`
`11397`	`11397`	`if (inference && !inference.isFixed) {`
`11398`		`- const key = (source.symbol ? getSymbolId(source.symbol) : "no symbol") + "," + getSymbolId(target.symbol);`
	`11398`	`+ const key = (source.symbol ? getSymbolId(source.symbol) + "," : "") + getSymbolId(target.symbol);`
`11399`	`11399`	`if (contains(mappedTypeStack, key)) {`
`11400`	`11400`	`return;`
`11401`	`11401`	`}`