From 8ee5f7d64f1ede8d16d01d1ca4d1004e8d68f25b Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 27 Nov 2016 19:49:57 -0800
Subject: [PATCH] Remove unused case in type inference

---
 src/compiler/checker.ts | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 2feb6b3f9c3..71dc4ec826e 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -8685,13 +8685,6 @@ namespace ts {
                         inferFromTypes(getUnionType(map(getPropertiesOfType(source), getTypeOfSymbol)), getTemplateTypeFromMappedType(<MappedType>target));
                         return;
                     }
-                    if (getObjectFlags(source) & ObjectFlags.Mapped) {
-                        // We're inferring from a mapped type to a mapped type, so simply infer from constraint type to
-                        // constraint type and from template type to template type.
-                        inferFromTypes(getConstraintTypeFromMappedType(<MappedType>source), constraintType);
-                        inferFromTypes(getTemplateTypeFromMappedType(<MappedType>source), getTemplateTypeFromMappedType(<MappedType>target));
-                        return;
-                    }
                 }
                 inferFromProperties(source, target);
                 inferFromSignatures(source, target, SignatureKind.Call);